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JS libraries

PnPm is nice package manager. redaxios is great for web fetches.

Web Dev frameworks​

  • Solid - Declarative, efficient, and flexible JavaScript library for building user interfaces. (Code) (Website Code) (Awesome) (HN)
  • San - Flexible JavaScript component framework.
  • hapi - Rich framework for building applications and services.
  • Koa - Smaller, more expressive, and more robust foundation for web applications and APIs. (Code) (koa-ts)
  • Umi - Pluggable enterprise-level react application framework.
  • Vue.js - Progressive JavaScript Framework.
  • Mithril - Modern client-side JavaScript framework for building Single Page Applications. (HN)
  • Neutrino dev
  • Alpine.js - Rugged, minimal framework for composing JavaScript behavior in your markup. (Awesome Alpine) (HN) (Web) (Docs)
  • After.js - Next.js-like framework for server-rendered React apps built with React Router 4.
  • Torus - Event-driven model-view UI framework for the web, focused on being tiny, efficient, and free of dependencies. (Web)
  • Hyperapp - Tiny framework for building web interfaces. (Web) (HN) (Hyperawesome)
  • Hyperapp FX - Effects for use with Hyperapp.
  • Phenomic - Modular website compiler (React, Webpack, Reason and whatever you want).
  • Halfmoon - Front-end framework with a built-in dark mode and full customizability using CSS variables; great for building dashboards and tools. (Docs)
  • Sinuous - Low-level UI library with a tiny footprint. (Docs)
  • Overture - Powerful JS library for building really slick web applications, with performance at, or surpassing, native apps.
  • Lucia - Tiny library for tiny web apps. (Docs)
  • Ractive.js - Next-generation DOM manipulation.
  • JSX Lite - Write components once, run everywhere. Compiles to Vue, React, Solid, Liquid, more.
  • Perlite - Hyperactiv + lit-html + extensions. Simple and declarative way to create rich client-side widgets designed with server-side apps in mind.
  • Democrat - Library that mimic the API of React (Components, hooks, Context...) but instead of producing DOM mutation it produces a state tree.
  • Raj - Elm Architecture for JavaScript.
  • Reframe - New kind of web framework.
  • observablehq/stdlib - Observable standard library.
  • Choo - Sturdy 4kb frontend framework. (Web)
  • Typera - Type-safe routes for Express and Koa.
  • Frourio - Fast and type-safe full stack framework, for TypeScript. (Web)
  • Svelto - Modular front end framework for modern browsers, with battery included: 100+ widgets and tools.
  • modular - Collection of tools and guidance to enable UI development at scale. (Tweet)
  • Turbo - Speed of a single-page web application without having to write any JavaScript. (Web)
  • Fre - Tiny Coroutine framework with Fiber.
  • Glimmer - Fast and light-weight UI components for the web. (Code)
  • Glimmer VM - Flexible, low-level rendering pipeline for building a "live" DOM from Handlebars templates that can subsequently be updated cheaply when data changes.
  • frint - Modular JavaScript framework for building scalable and reactive applications.
  • Next.js - Framework for server-rendered or statically-exported React apps.
  • Nano Router - Framework agnostic minimalistic router with a focus on named routes.
  • tiny-request-router - Fast, generic and type safe router (match request method and path).
  • Synergy - Tiny runtime library for building web user interfaces. (HN)
  • dflex - JavaScript Project to Manipulate DOM Elements.
  • morphdom - Fast and lightweight DOM diffing/patching (no virtual DOM needed).
  • Forgo - Ultra-light UI runtime. Makes it super easy to create modern web apps using JSX (like React).
  • Whats Up - Front-end framework based on ideas of streams and fractals.
  • Boost - Collection of type-safe cross-platform packages for building robust server-side and client-side systems.
  • Nostalgie - Opinionated, full-stack, runtime-agnostic framework for building web apps and web pages using react. (Web)
  • Lumino - Library for building interactive web applications.
  • Skruv - No-dependency, no-build, small JS framework. (Code) (HN)
  • jQuery - Fast, small, and feature-rich JavaScript library. (Web)
  • neo.mjs - Create blazing fast multithreaded Web Apps.
  • presta - Hyper minimal framework for the modern web. (Web)
  • Haptic - Reactive web rendering in TSX with no virtual DOM, no compilers, and no magic.
  • Astro - Build faster websites with less client-side JavaScript. (Web) (HN) (Look at Building with Astro) (Play) (Tweet)
  • Logux Client - New way to connect client and server. Instead of sending HTTP requests, it synchronizes log of operations between client, server, and other clients. (Examples)
  • CalDOM - Agnostic, reactive & minimalist (3kb) JavaScript UI library with direct access to native DOM. (Web)
  • Trimmings - Zero-configuration JavaScript library that adds a layer of smooth and fast in-page interaction to your web pages.
  • Piral - Easily build a next generation portal application using microfrontends. (Code)
  • Qiankun - Implementation of Micro Frontends, which based on single-spa. It aims to make it easier and painless to build a production-ready microfront-end architecture system. (Web)
  • Drayman - Server-side component framework.
  • yeet - Teeny-weeny front end framework.
  • Xeact - Revolutionary Femtoframework For High Efficiency JavaScript Development. (Article)
  • $mol - Fastest reactive micro-modular compact flexible lazy ui web framework.
  • Reflex - Functional reactive UI library.
  • Gestalt - Modern opinionated and batteries-included NodeJS framework for building web sites and apps.
  • Logux Core - New way to connect client and server. Instead of sending HTTP requests (e.g., AJAX and GraphQL) it synchronizes log of operations between client, server, and other clients.
  • set-dom - Lightweight DOM diffing with plain old HTML.
  • Ralix - Micro framework for building and organizing your front-end.
  • rawth - Pure functional isomorphic router based on streams.
  • Corset - Declarative data bindings, bring your own backend. (Web)
  • hdot - Zero-dependency, buildless, terse, and type-safe way to write HTML in JavaScript.
  • SurveyJS - JavaScript Survey and Form Library. (Web)
  • Helmet - Help secure Express apps with various HTTP headers.
  • Reactif - Fast 5kB reactive & elegant functional library for rapidly building modern UIs on the web.
  • Swup - Complete, flexible, extensible and easy to use page transition library for your static web.
  • Taxi - Library for adding AJAX navigation and beautiful transitions to your website.
  • Tornis - Helps you watch and respond to changes in your browser's viewport.

Animation​

  • Anime.js - JavaScript animation engine.
  • popmotion - Functional, reactive animation library.
  • impress.js - Presentation framework based on the power of CSS3 transforms and transitions.
  • Pts - Library for visualization and creative-coding. (Web)
  • lax.js - Simple & lightweight (<4kb gzipped) vanilla JavaScript library to create smooth & beautiful animations when you scroll.
  • Flipping - Library (and collection of adapters) for implementing FLIP transitions.
  • Ola - Smooth animation library for interpolating numbers.
  • react-spring - Spring physics based React animation library.
  • FAT - Web's fastest and most lightweight animation tool.
  • React Easy Flip - Lightweight React library for smooth FLIP animations.
  • AOS - Animate on scroll library.
  • flubber - Tools for smoother shape animations.
  • tatween - JavaScript library providing a block-based animation API.

CLI​

  • mri - Quickly scan for CLI flags and arguments.
  • qoa - Minimal interactive command-line prompts.
  • sade - Smooth (CLI) Operator.
  • yargs-parser - Mighty option parser used by yargs.
  • boxen-cli - Create boxes in the terminal.
  • command-line-args - Mature, feature-complete library to parse command-line options.
  • Prompts - Lightweight, beautiful and user-friendly interactive prompts.
  • minimist - Parse argument options.
  • Inquirer.js - Collection of common interactive command line user interfaces.
  • Handle-CLI-Error - Error handler for CLI applications.

ML​

  • mind - Neural network library built in JavaScript.

Test​

  • Unexpected - Extensible BDD assertion toolkit. (Docs)
  • Fishery - Library for setting up JavaScript objects as test data.
  • pentf - Parallel end-to-end test framework.
  • test-flat - Test framework extension to support resources teardown and cleanup in flat tests.
  • zora - Lightest, yet Fastest JavaScript test runner for nodejs and browsers.
  • Vest - Declarative Validation Testing.
  • uvu - Extremely fast and lightweight test runner for Node.js and the browser.
  • Spearmint - Testing, simplified. An inclusive, accessibility-first GUI for generating clean, semantic JavaScript tests in only a few clicks of (or keystrokes) of a button. (Web)
  • StrykerJS - Mutation testing for JavaScript and friends. (Web)
  • xv - Simple, fast and small test runner.
  • Peeky - Test framework for the curious minds. (Web)
  • gremlins.js - Monkey testing library for web apps and Node.js.
  • JSVerify - Property-based checking. Like QuickCheck.
  • brittle - TAP test runner built for modern times.
  • fake-timers - Fake setTimeout and friends (collectively known as "timers"). Useful in your JavaScript tests.
  • esmock - Provides native ESM import mocking for unit tests.

Graphics​

  • Lumen 2D - 2D javascript renderer using web workers.
  • Blurry - Simulating depth of field with particles on a shader.
  • Window.js - Open-source JavaScript runtime for desktop graphics programming. (HN)
  • glsl-tone-map - Collection of tone mapping functions available both as ES modules strings and as GLSL files for use with glslify.

State management​

API bindings​

DB​

  • sql.js - SQLite compiled to JavaScript. Allows you to create a relational database and query it entirely in the browser. (Docs) (HN)
  • SQigiL - Postgres SQL template string for Javascript.
  • Postgrest JS - Isomorphic JavaScript client for PostgREST.
  • Connect PG Simple - Simple, minimal PostgreSQL session store for Express/Connect.
  • SyncedDB - Makes it easy to write offline-first applications with realtime syncing and server side persistence.
  • Dexie.js - Minimalistic IndexedDB Wrapper. (Docs)
  • Keyv - Simple key-value storage with support for multiple backends.
  • Dexie.js - Minimalistic Wrapper for IndexedDB. (Web)
  • lowdb - Simple to use local JSON database.
  • PicoDB - Tiny in-memory database (MongoDB like) that stores JSON documents.
  • level-web-stream - Read from an abstract-level database using Web Streams.
  • iron-store - In-memory, signed and encrypted JavaScript store.
  • Keyv - Simple key-value storage with support for multiple backends.
  • Quickgres - Native-JS PostgreSQL client library.
  • invert-kv - Invert the key/value of an object.
  • HashQL - Access DB from UI.
  • heapify - Fastest JavaScript priority queue out there. Zero dependencies.
  • Databricks SQL Driver for NodeJS

React​

Math​

  • Eigen.js - Port of the Eigen C++ linear algebra library.

Crypto​

  • Elliptic - Fast Elliptic Curve Cryptography in plain JS.
  • TweetNaCl.js - Port of TweetNaCl cryptographic library to JavaScript.
  • Tiny WebCrypto - Tiny isomorphic WebCrypto object, it just gives you the native one the current platform provides.
  • hypercore-crypto - Crypto primitives used in hypercore, extracted into a separate module.

Other​

  • micro github - Tiny microservice that makes adding authentication with GitHub to your application easy.
  • pico.js - Face detection library in 200 lines of JavaScript.
  • mdxc - Use React Components within Markdown.
  • ReLaXeD - Create PDF documents using web technologies. (Examples)
  • Dragula - Drag and drop so simple it hurts.
  • Hammer.js - Multi-touch gestures.
  • emittery - Simple and modern async event emitter.
  • Xstate - State machines and statecharts for the modern web. (State Machines Workshop) (Tweet)
  • XState Helpers - Collection of helpers for XState with React.
  • xstate-component-tree - Build a tree of UI components based on your state chart.
  • virtual-scroller - Maps a provided set of JavaScript objects onto DOM nodes, and renders only the DOM nodes that are currently visible, leaving the rest "virtualized".
  • jSPDF - Client-side JavaScript PDF generation for everyone.
  • ForgJS - JavaScript lightweight object validator.
  • faker.js - Generate massive amounts of realistic fake data in Node.js and the browser.
  • arg - Simple argument parsing.
  • fbt - JavaScript Internationalization Framework.
  • fuzzysearch - Tiny and blazing-fast fuzzy search in JavaScript.
  • normalizr - Normalizes nested JSON according to a schema.
  • FBJS - Collection of utility libraries used by other Facebook JS projects.
  • Uppy - Next open source file uploader for web browsers. (Web)
  • ScrollReveal - Animate elements as they scroll into view.
  • Shiny - Add shiny reflections to text, backgrounds, and borders on devices that support the DeviceMotion event.
  • Hotkey Behavior - Trigger a action on element when keyboard hotkey is pressed.
  • Bili - Makes it easier to bundle JavaScript libraries.
  • Memoizee - Complete memoize/cache solution for JavaScript.
  • Immer - Create the next immutable state by mutating the current one.
  • FlexSearch - Web's fastest and most memory-flexible full-text search library with zero dependencies.
  • cofx - Node and javascript library that helps developers describe side-effects as data in a declarative, flexible API.
  • Mercury Parser - Extracts the bits that humans care about from any URL you give it.
  • Refract - Harness the power of reactive programming to supercharge your components.
  • MemJS - Memcache client for node using the binary protocol and SASL authentication.
  • memfs - In-memory filesystem with Node's API.
  • Accounts - Fullstack authentication and accounts-management for GraphQL and REST.
  • Cleave.js - Format input text content when you are typing...
  • Unistore - Tiny 350b centralized state container with component bindings for Preact & React.
  • Ramda - Practical functional library for JavaScript programmers.
  • fromfrom - JS library written in TS to transform sequences of data from format to another.
  • Editor.js - Block-styled editor with clean JSON output.
  • ijk - Transforms arrays into virtual DOM trees.
  • Cleave.js - Format input text content when you are typing.
  • Oboe.js - Streaming approach to JSON. Oboe.js speeds up web applications by providing parsed objects before the response completes.
  • Choices.js - Vanilla JS customisable select box/text input plugin.
  • Shepherd - Guide your users through a tour of your app.
  • object-cull - Create a copy of an object with just the bits you actually need.
  • Sigma - JavaScript library dedicated to graph drawing.
  • interact.js - JavaScript drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers.
  • flru - Tiny (215B) and fast Least Recently Used (LRU) cache.
  • Yup - Dead simple Object schema validation.
  • Lerna - Tool for managing JavaScript projects with multiple packages.
  • WikiJs - Wikipedia Interface for Node.js.
  • virtual-audio-graph - Library for declaratively manipulating the Web Audio API.
  • deep-object-diff - Deep diffs two objects, including nested structures of arrays and objects, and returns the difference.
  • Snarkdown - Snarky 1kb Markdown parser written in JavaScript.
  • Terser - JavaScript parser, mangler, optimizer and beautifier toolkit for ES6+.
  • AppAuthJS - JavaScript client SDK for communicating with OAuth 2.0 and OpenID Connect providers.
  • expr-eval - Mathematical expression evaluator in JavaScript.
  • robust-predicates - Fast robust predicates for computational geometry in JavaScript.
  • Sanctuary - JavaScript functional programming library inspired by Haskell and PureScript.
  • modali - Delightful modal dialog component for React, built from the ground up to support React Hooks.
  • Tweakpane - Compact GUI for fine-tuning parameters and monitoring value changes.
  • crocks - Collection of well known Algebraic Data Types for your utter enjoyment.
  • Just - Library of zero-dependency npm modules that do just do one thing.
  • nanoid - Tiny (139 bytes), secure, URL-friendly, unique string ID generator for JavaScript.
  • debug - Tiny JavaScript debugging utility modelled after Node.js core's debugging technique. Works in Node.js and web browsers.
  • roughViz.js - Reusable JavaScript library for creating sketchy/hand-drawn styled charts in the browser.
  • Mitt - Tiny 200 byte functional event emitter / pubsub.
  • RequireJS - File and module loader for JavaScript.
  • Zero - 3D graphics rendering pipeline. Implemented in JavaScript. Run in a terminal.
  • xstate-viz - Visualize state charts.
  • htmr - Simple and lightweight (< 2kB) HTML string to React element conversion library.
  • react-jsx-parser - React component which can parse JSX and output rendered React Components.
  • Static Land - Specification for common algebraic structures in JavaScript based on Fantasy Land.
  • sorted-queue - Sorted queue, based on an array-backed binary heap.
  • polendina - Non-UI browser testing for JavaScript libraries from the command-line.
  • agadoo - Check whether a package is tree-shakeable.
  • Fielder - React form library which adapts to change.
  • lemonad - Functional programming library for JavaScript. An experiment in elegant JS.
  • Mockttp - Lets you quickly & reliably test HTTP requests & responses in JavaScript, in both Node and browsers.
  • Flowy - Minimal javascript library to create flowcharts.
  • d3-dag - Layout algorithms for visualizing directed acyclic graphs.
  • renature - Physics-based animation library for React focused on modeling natural world forces.
  • Morphism - Do not repeat anymore your objects transformations.
  • Tonic - Stable, Minimal, Auditable, Build-Tool-Free, Low Profile Component Framework.
  • Quiet.js - Transmit data with sound using Web Audio -- Javascript binding for libquiet.
  • Bindery - Library for designing printable books with HTML and CSS.
  • Wretch - Tiny wrapper built around fetch with an intuitive syntax.
  • Virt.js - Free collection of useful standard devices, that can be used to power various engine that makes use of the exposed interfaces.
  • Path-to-RegExp - Turn a path string such as /user/:name into a regular expression.
  • Bacon.js - Functional reactive programming library for TypeScript and JavaScript.
  • GGEditor - Visual graph editor based on G6 and React.
  • Arbor - Graph visualization library using web workers and jQuery. (Web)
  • fsm-as-promised - Finite state machine library using ES6 promises.
  • x-spreadsheet - Web-based JavaScript（canvas）spreadsheet.
  • IsoCity - Isometric city builder in JavaScript.
  • car - Simple 2d car physics with JavaScript. (HN)
  • Picomatch - Blazing fast and accurate glob matcher written in JavaScript.
  • react-isomorphic-data - Easily fetch data in your React components, with similar APIs to react-apollo.
  • klona - Tiny (228B) and fast utility to "deep clone" Objects, Arrays, Dates, RegExps, and more.
  • ScrollMagic - JavaScript library for magical scroll interactions.
  • GoJS - JavaScript and TypeScript library for building interactive diagrams and graphs.
  • Rete - JavaScript framework for visual programming and creating node editor. (HN)
  • Pre3d - JavaScript 3d rendering engine.
  • dancer.js - High-level audio API, designed to make sweet visualizations.
  • model-viewer - Easily display interactive 3D models on the web and in AR.
  • Spars - General toolkit for creating interactive web experiences.
  • NeuroJS - JavaScript deep learning and reinforcement learning library.
  • Hareactive - Purely functional reactive programming library.
  • Mirage JS - Client-side server to develop, test and prototype your JavaScript app.
  • dfa - State machine compiler with regular expression style syntax.
  • Jtree - Tree Notation TypeScript/Javascript library.
  • Hydra - Livecoding networked visuals in the browser.
  • p-queue - Promise queue with concurrency control.
  • gsheets - Get public Google Sheets as plain JavaScript/JSON.
  • alga-ts - Algebraic graphs implementation in TypeScript.
  • Chart.js - Simple HTML5 Charts using the <canvas> tag. (Awesome)
  • on-change - Watch an object or array for changes.
  • clean-set - Deep assignment alternative to the object spread operator and Object.assign.
  • Search Query Syntax Parser
  • Uppload - Better JavaScript image uploader with 30+ plugins.
  • pino - Super fast, all natural JSON logger.
  • Orbit - Composable data framework for ambitious web applications.
  • panzoom - Universal pan and zoom library (DOM, SVG, Custom).
  • intl-tel-input - JavaScript plugin for entering and validating international telephone numbers.
  • three.js - JavaScript 3D library.
  • shortid - Short id generator. Url-friendly. Non-predictable. Cluster-compatible.
  • styx - Derives a control flow graph from a JavaScript AST.
  • Crossfilter - JavaScript library for exploring large multivariate datasets in the browser.
  • SiriWave - Apple Siri wave-form replicated in a JS library.
  • Shades - Lodash-inspired lens-like library for Javascript.
  • mxGraph - Fully client side JavaScript diagramming library.
  • cacache - Node.js library for managing local key and content address caches.
  • enhanced-resolve - Offers an async require.resolve function. It's highly configurable.
  • notevil - Evalulate javascript like the built-in javascript eval() method but safely.
  • react-digraph - Library for creating directed graph editors.
  • bent - Functional JS HTTP client (Node.js & Fetch) w/ async await.
  • CLUI - Collection of JavaScript libraries for building command-line interfaces with context-aware autocomplete. (Article) (HN)
  • cosha - Colorful shadows for your images.
  • Rambda - Faster and smaller alternative to Ramda.
  • MathJax - Open-source JavaScript display engine for LaTeX, MathML, and AsciiMath notation that works in all modern browsers. (Web) (HN)
  • Litepicker - Date range picker - lightweight, no dependencies.
  • core-js - Modular standard library for JavaScript.
  • timeago.js - Nano library (less than 2 kb) used to format datetime with *** time ago statement. eg: '3 hours ago'.
  • Serialize JavaScript - Serialize JavaScript to a superset of JSON that includes regular expressions, dates and functions.
  • Tippy.js - Tooltip, popover, dropdown, and menu library.
  • howler.js - JavaScript audio library for the modern web.
  • date-fns - Modern JavaScript date utility library.
  • Midi - Convert MIDI into Tone.js-friendly JSON.
  • face-api.js - JavaScript API for face detection and face recognition in the browser and nodejs with tensorflow.js.
  • Spotlight - Search widget for your web API.
  • Fuse - Lightweight fuzzy-search, in JavaScript.
  • Xterm.js - Terminal for the web. (Web) (HN)
  • Change Case - Convert strings between camelCase, PascalCase, Capital Case, snake_case and more.
  • ChronoGraph - Reactive, graph-based, computation engine.
  • Sprotty - Diagramming framework for the web.
  • prerender.js - Loads pages quickly on any browser.
  • on-finished - Execute a callback when a request closes, finishes, or errors.
  • ColorFns - Modern JavaScript color utilities library.
  • grapheme-splitter - JavaScript library that breaks strings into their individual user-perceived characters.
  • Web Animations - JavaScript implementation of the Web Animations API.
  • p-limit - Run multiple promise-returning & async functions with limited concurrency.
  • Highcharts JS - JavaScript charting library based on SVG.
  • μPlot - Small, fast chart for time series, lines, areas, ohlc & bars.
  • Baobab - JavaScript & TypeScript persistent and optionally immutable data tree with cursors.
  • emoji-regex - Regular expression to match all Emoji-only symbols as per the Unicode Standard.
  • MerkleTree.js - Construct Merkle Trees and verify proofs in JavaScript.
  • Snabbdom - Virtual DOM library with focus on simplicity, modularity, powerful features and performance.
  • Thwack - Tiny modern data fetching solution.
  • Regenerate - Generate JavaScript-compatible regular expressions based on a given set of Unicode symbols or code points.
  • Crank.js - Write JSX-driven components with functions, promises and generators. (Article) (Reddit) (HN)
  • redaxios - Axios API, as an 800 byte Fetch wrapper.
  • Math.js - Extensive math library for JavaScript and Node.js.
  • pixelmatch - Smallest, simplest and fastest JavaScript pixel-level image comparison library.
  • quilt - Loosely related set of packages for JavaScript / TypeScript projects at Shopify.
  • jsondiffpatch - Diff & patch JavaScript objects.
  • RVal - Minimalistic transparent reactive programming library.
  • orbit-controls - Generic controls for orbiting a target in 3D.
  • estree-walker - Traverse an ESTree-compliant AST.
  • Jitsi Meet API library - Can use Jitsi Meet API to create Jitsi Meet video conferences with a custom GUI.
  • isomer - Simple isometric graphics library for HTML5 canvas.
  • Schema to Yup schema
  • Mordred - Source data from anywhere, for Next.js, Nuxt.js, Eleventy and many more.
  • ASScroll - Hybrid smooth scroll setup that combines the performance gains of virtual scroll with the reliability of native scroll.
  • Gallery - Light, responsive, and performant JavaScript gallery.
  • Logux Server - Build own Logux server or make proxy between WebSocket and HTTP backend on any language.
  • @expo/results - Efficient, standards-compliant library for representing results of successful or failed operations.
  • Emojibase - Collection of lightweight, up-to-date, pre-generated, specification compliant, localized emoji JSON datasets, regex patterns, and more.
  • serve-favicon - Node.js middleware for serving a favicon.
  • download - Download and extract files.
  • color2k - Color parsing and manipulation lib served in 2kB or less.
  • Sandstorm - Open source platform for self-hosting web apps. (Code)
  • transformation-matrix - JS isomorphic 2D affine transformations written in ES6 syntax.
  • Muuri - JavaScript layout engine that allows you to build all kinds of layouts and make them responsive, sortable, filterable, draggable and/or animated.
  • Split - Unopinionated utilities for resizeable split views.
  • Parallax Engine - Reacts to the orientation of a smart device.
  • fastq - Fast, in memory work queue.
  • ac-colors - Reactive JavaScript color library that can freely convert color formats.
  • sonic-boom - Extremely fast utf8 only stream implementation.
  • Rough Notation - Small JavaScript library to create and animate annotations on a web page. (HN)
  • SqueakJS - Squeak VM for the Web and Node.js. (Web)
  • fit-textarea - Automatically expand a <textarea> to fit its content, in a few bytes.
  • NanoPop - Ultra Tiny, Opinionated Positioning Engine. (Web)
  • Angelfire - Lets you quickly build right-click-enabled context menus and drop-down menus for any element on your webpage.
  • csv-parser - Streaming csv parser inspired by binary-csv that aims to be faster than everyone else.
  • updeep - Easily update nested frozen objects and arrays in a declarative and immutable manner.
  • Hull.js - JavaScript library that builds concave hull by set of points.
  • StegCloak - Hide secrets with invisible characters in plain text securely using passwords.
  • p-min-delay - Delay a promise a minimum amount of time.
  • match-when - Pattern matching for modern JavaScript.
  • NumJs - Like NumPy, in JavaScript.
  • spect - Reactive aspect-oriented web-framework.
  • js-cid - CID implementation in JavaScript.
  • js-ipld-block - Implementation of the Block data structure in JavaScript.
  • wildcard-api - Functions as API.
  • bpmn-js - BPMN 2.0 rendering toolkit and web modeler.
  • fit-curve - JavaScript implementation of Philip J. Schneider's "Algorithm for Automatically Fitting Digitized Curves" from the book "Graphics Gems".
  • clean-deep - Remove falsy, empty or nullable values from objects.
  • regular-table - Regular <table> library, for async and virtual data models.
  • Stimulus - Modest JavaScript framework for the HTML you already have. (Web) (Awesome)
  • bigpicture.js - Library that allows infinite panning and infinite zooming in HTML pages. (Web)
  • Tragopan - Minimal dependency-free pan/zoom library. (HN)
  • Deakins - Small Canvas 2D Camera.
  • Turbolinks - Makes navigating your web application faster.
  • CindyJS - Framework to create interactive (mathematical) content for the web. (Web) (HN)
  • axios - Promise based HTTP client for the browser and nodeJS.
  • astray - Walk an AST without being led astray.
  • vnopts - Validate and normalize options.
  • canvas confetti - On-demand confetti gun. (Docs)
  • Graphlib - JavaScript library that provides data structures for undirected and directed multi-graphs along with algorithms that can be used with them.
  • Dagre - JavaScript library that makes it easy to lay out directed graphs on the client-side.
  • ecsy - Highly experimental Entity Component System framework implemented in javascript, aiming to be lightweight, easy to use and with good performance. (Docs)
  • Object Visualizer - Visualize the JSON object to the DOM. (HN)
  • Reach Schema - Functional schema-driven JavaScript object validation library.
  • @cycle/callbags - Set of commonly used stream operators implemented as callbags with Typescript and ES modules.
  • umbrella - Broadly scoped ecosystem & mono-repository of ~135 TypeScript projects for functional, data driven development.
  • HTM - JSX-like syntax in plain JavaScript - no transpiler necessary.
  • NativeScript - Framework for building native iOS and Android apps using JavaScript and CSS.
  • schema-dts - JSON-LD TypeScript types for Schema.org vocabulary.
  • flatpickr - JS date time picker.
  • superjson - Safely serialize JavaScript expressions to a superset of JSON, which includes Dates, BigInts, and more.
  • lazy-collections - Collection of fast and lazy operations.
  • Perfect Arrows - Set of functions for drawing perfect arrows between points and shapes.
  • Autocomplete.js - Fast and full-featured autocomplete library.
  • urlcat - URL builder library for JavaScript. (Docs)
  • Diagram Maker - Library to display an interactive editor for any graph-like data. (Docs) (HN)
  • js-coroutines - 60fps with JavaScript Coroutines for idle processing and animation.
  • Transducist - Ergonomic JavaScript/TypeScript transducers for beginners and experts.
  • decimal.js - Arbitrary-precision Decimal type for JavaScript.
  • Constant-Time JavaScript - Constant-time algorithms written in TypeScript.
  • SheetJS - Spreadsheet Data Toolkit. Read, edit, and export spreadsheets. Works in web browsers and servers. (Web)
  • Z - Pattern Matching for JavaScript. (Web)
  • Graphology - Robust & multipurpose Graph object for JavaScript & TypeScript. (Docs)
  • weak-napi - Make weak references to JavaScript Objects.
  • nestie - Tiny (211B) and fast utility to expand a flattened object.
  • Mock.js - Simulation data generator.
  • Detect features - Detect and report browser and hardware features.
  • JSZip - Create, read and edit .zip files with JavaScript.
  • Classnames - Simple javascript utility for conditionally joining classNames together.
  • cx - Concatenate your classes (with shortcuts).
  • Defer - Tiny, type-safe, JavaScript-native defer implementation.
  • freshie - Fresh take on building universal applications with support for pluggable frontends and backends.
  • Luckysheet - Online spreadsheet like excel that is powerful, simple to configure, and completely open source. (Docs)
  • noUiSlider - Lightweight JavaScript range slider.
  • QRCode.js - Cross-browser QRCode generator for JavaScript. (Web)
  • HyperScript - Create HyperText with JavaScript, on client or server. (Web) (HN)
  • hyperscript-helpers - Terse syntax for hyperscript.
  • EnlighterJS - Open source syntax highlighter written in pure javascript.
  • eslisp - S-expression syntax for JavaScript, with Lisp-like hygienic macros. Minimal core, maximally customisable.
  • Smoldash - Tiny lodash alternative built for the modern web.
  • TypewriterJS - Simple yet powerful native javascript plugin for a cool typewriter effect.
  • sse.js - Flexible Server Side Events source for JavaScript.
  • Arkit - Visualises JavaScript, TypeScript and Flow codebases as meaningful and committable architecture diagrams. (Web)
  • jsii - Allows code in any language to naturally interact with JavaScript classes.
  • proxy-memoize - Intuitive magical memoization library with Proxy and WeakMap. (Tweet)
  • CosmJS - Modular library consisting of multiple packages to power web experiences.
  • Arwes - Futuristic Sci-Fi and Cyberpunk Graphical User Interface Framework for Web Apps. (Web)
  • psl (Public Suffix List) - JavaScript domain name parser based on the Public Suffix List.
  • invariant-packages - Packages for working with invariant(condition, message) assertions.
  • evt - EventEmitter's typesafe replacement.
  • webscan - Browser-based network scanner & local-IP detection.
  • Pill - Add dynamic content loading to static sites with only 1 KiB of JS.
  • fast-deep-equal - Fastest deep equal with ES6 Map, Set and Typed arrays support.
  • preview-card - Customizable social media preview image.
  • egjs-flicking - Easy-to-use and performant infinite carousel.
  • SSE-Z - Slim, easy-to-use wrapper around EventSource.
  • DefinitelyExported - Community-defined export maps for popular npm packages.
  • jsdiff - JavaScript text differencing implementation.
  • HyperFormula - Open source, spreadsheet-like calculation engine.
  • fast-json-stringify - Significantly faster than JSON.stringify() for small payloads.
  • isbot - JavaScript module that detects bots/crawlers/spiders via the user agent.
  • Valtio - Makes proxy-state simple for React and Vanilla. (Demo) (How Valtio Proxy State Works)
  • pica - High quality image resize in browser.
  • Planton - Database-agnostic task scheduler.
  • mime-types - JavaScript content-type utility.
  • match-sorter - Simple, expected, and deterministic best-match sorting of an array in JavaScript.
  • Fetch Event Source - Better API for making Event Source requests, with all the features of fetch().
  • rafz - Coordinate requestAnimationFrame calls across your app and/or libraries.
  • p-state - Inspect the state of a promise.
  • v86 - x86 virtualization in JavaScript, running in your browser and NodeJS. (Web)
  • Notyf - Minimalistic, responsive, vanilla JavaScript library to show toast notifications.
  • Moveable - Draggable, Resizable, Scalable, Rotatable, Warpable, Pinchable, Groupable, Snappable.
  • Execa - Process execution for humans.
  • quick-lru - Simple “Least Recently Used” (LRU) cache.
  • Deepdash - Tree traversal library written in Underscore/Lodash fashion. (Docs)
  • Nano Delay - Tiny (25 bytes) Promise wrapper around setTimeout.
  • ES Module Lexer - Low-overhead lexer dedicated to ES module parsing for fast analysis.
  • keez - Frictionless hotkey handling for browsers.
  • Zet - Set() as it should be.
  • Ketting - Hypermedia client for JavaScript.
  • yocto-queue - Tiny queue data structure.
  • Nano JSX - Lightweight 1kB JSX library. (Web)
  • Effects.js - Algebraic effects in javascript with scoped handlers, multishot delimited continuations, stack safety and do notation.
  • flatten-js - JavaScript library for 2d geometry.
  • is-retry-allowed - Check whether a request can be retried based on the error.code.
  • backfill - JavaScript caching library for reducing build time.
  • S-Libs - Collection of libraries for any of JS, RxJS, or Angular.
  • watchpack - Wrapper library for directory and file watching.
  • async-tag - Resolves template literals tag values before applying a generic tag.
  • serialize-error - Serialize/deserialize an error into a plain object.
  • errorstacks - Tiny library to parse error stack traces.
  • Ape-ECS - Entity-Component-System library for JavaScript.
  • rrule.js - JavaScript library for working with recurrence rules for calendar dates as defined in the iCalendar RFC and more. (Demo)
  • scroller - Super-tiny library for your scrollytelling needs.
  • Isomorphic DOMPurify - Makes it possible to use DOMPurify on server and client in the same way.
  • navaid - Navigation aid (aka, router) for the browser in 850 bytes.
  • glob-to-regexp - Convert a glob to a regular expression.
  • cmap - Interactive visualization library for concept map.
  • lezer-tree - Incremental GLR parser intended for use in an editor or similar system.
  • matchit - Quickly parse & match URLs.
  • acorn - Tiny, fast JavaScript parser, written completely in JavaScript.
  • jsesc - Given some data, jsesc returns the shortest possible stringified & ASCII-safe representation of that data.
  • fastjson - Single-tweet, standards-compliant, high-performance JSON stack.
  • grfn - Tiny (~400B) utility that executes a dependency graph of async functions as concurrently as possible.
  • Nunjucks - Powerful templating engine with inheritance, asynchronous control, and more. (Web)
  • Behavior3JS - Structures and algorithms that assist you in the task of creating intelligent agents for your game or application.
  • qs - Querystring parser with nesting support.
  • Exifer - Small module that read JPEG/TIFF meta-data.
  • jsVideoUrlParser - JavaScript parser to extract information like provider, channel, id, start time from YouTube, Vimeo, Dailymotion, Twitch,... urls.
  • TypeDI - Dependency injection tool for TypeScript and JavaScript.
  • ibridge - Tiny, promise based, type safe library for easy, bidirectional and secure iframe communication.
  • Monio - Async-capable IO monad for JS.
  • Total.js - Excellent and stable server-side Node.js framework, client-side library for creating web applications with more than 230 UI components for free.
  • memoize-one - Memoization library which only remembers the latest invocation.
  • pjson - JSON stream parser for Go.
  • InternMap - Map and Set with automatic key interning.
  • geometry-processing-js - Fast, general-purpose framework for geometry processing on the web.
  • Iterplus - Best of Rust/Haskell/Python iterators in JavaScript.
  • SmolScroll - Tiny, flexible scroll listener with React support.
  • Observable parser
  • Robot - Functional, immutable Finite State Machine library. (Docs)
  • Enmap - Enhanced Map structure with additional utility methods.
  • Honeycomb - Create hex grids easily, in node or the browser.
  • chunkify - Split an iterable into evenly sized chunks.
  • wobble - Tiny spring physics micro-library that models a damped harmonic oscillator.
  • tmp-cache - Least-recently-used cache in 35 lines of code.
  • static-eval - Evaluate statically-analyzable expressions.
  • Sparse Octree - Sparse, pointer-based octree data structure.
  • Signature Pad - JavaScript library for drawing smooth signatures.
  • dom-to-image-retina - dom-to-image but generates high-resolution images.
  • loglevel - Minimal lightweight logging for JavaScript, adding reliable log level methods to wrap any available console.log methods.
  • Perfect Freehand - Draw perfect freehand lines. (Demo)
  • Alo - Full-fledged state management. (Docs)
  • Form-Data - Library to create readable "multipart/form-data" streams. Can be used to submit forms and file uploads to other web applications.
  • conf - Simple config handling for your app or module.
  • gifenc - Fast and lightweight pure-JavaScript GIF encoder.
  • tldts - Blazing Fast URL Parsing.
  • Barba.js - Easy-to-use library that helps you create fluid and smooth transitions between your website's pages.
  • Shuffle.js - Categorize, sort, and filter a responsive grid of items. (Web)
  • stdlib - Standard library for JavaScript and Node.js. (Web)
  • gensync - Allows users to use generators in order to write common functions that can be both sync or async.
  • monet.js - Monadic types library for JavaScript.
  • VivaGraph - Graph drawing library for JavaScript.
  • Crochet - Small engine for story-driven games.
  • diary - Zero-dependency, fast logging library for both Node and Browser.
  • tinydate - Tiny reusable date formatter.
  • FingerprintJS - Browser fingerprinting library with the highest accuracy and stability.
  • Antiutils - TypeScript/JavaScript utilities for those who don't like utilities.
  • linked-list - Minimalistic linked lists.
  • msgpack-javascript - JavaScript implementation of MessagePack, an efficient binary serilization format.
  • Tagify - Lightweight, efficient Tags input component.
  • betterator - Better sync and async iterator API.
  • XState Catalogue - Professionally designed, interactive state machines. (Web)
  • Combine-Promises - Like Promise.all(array) but with an object instead of an array.
  • async-retry - Retrying made simple, easy, and async.
  • party.js - JavaScript library to brighten up your user's site experience with visual effects.
  • Scule - String case utils.
  • Nano Events - Simple and tiny event emitter library for JavaScript.
  • stoplight/yaml - Useful functions when working with YAML.
  • Safe Await - Safely use async/await without all the try catch blocks.
  • Casbin.js - Authorization library that supports access control models like ACL, RBAC, ABAC in Frontend JavaScript.
  • tidy.js - Tidy up your data with JavaScript, inspired by dplyr and the tidyverse.
  • keypather - Get, set, or delete deep object values using keypath strings (supports immutable operations) and more.
  • Veramo - JavaScript Framework for Verifiable Data. (Web)
  • it - Utility modules to make dealing with async iterators easier.
  • DiceBear - Avatar library for designers and developers. (Web)
  • JParticles - Concise, lightweight, and efficient Canvas library for building some cool particle effects. (Web)
  • Arquero - Query processing and transformation of array-backed data tables.
  • TypeIt - Most versatile JavaScript animated typing utility on the planet. (Web)
  • ASON - Data oriented algorithm designed for compact and speedy storage of AssemblyScript objects in a binary format.
  • refractor - Lightweight, robust, elegant virtual syntax highlighting using Prism.
  • Expounder - Library for explaining things in HTML.
  • timidity - Play MIDI files in the browser w/ Web Audio, WebAssembly, and libtimidity.
  • buffer - Buffer module from node.js, for the browser.
  • pixi-graph - Graph visualization library using PIXI.js and Graphology.
  • xache - Auto expiring, max sizable cache.
  • ndarray - Modular multidimensional arrays for JavaScript.
  • LUME AutoLayout - Apple’s Auto Layout for JavaScript. (HN)
  • Zoomtastic - Tiny image zoomer for web.
  • Patronum - Effector operators library delivering modularity and convenience.
  • Cabin - Best JavaScript and Node.js logging service and logging npm package.
  • Normalized Cache - Cache for storing normalized data.
  • itty router - Router, designed for Express.js-like routing within Cloudflare Workers (or anywhere else).
  • vLitejs - Fast and lightweight JavaScript library for customizing video and audio player.
  • async-broadcaster - Observable alternative using async iterators.
  • Hover Effect - JavaScript library to draw and animate images on hover.
  • Js Search - Efficient, client-side search library for JavaScript and JSON objects.
  • js-worker-search - Full text client-side search based on js-search but with added web-worker support for better performance.
  • domino - Server-side DOM implementation based on Mozilla's dom.js.
  • Momoa JSON - JSON parser, tokenizer, traverser, and printer.
  • js-confetti - JS Confetti library that supports emojis.
  • quetie - Cutest and tiniest queue/deque implementation.
  • p-map - Map over promises concurrently.
  • jsBezier - Bezier curve helper functions for JavaScript.
  • hydrate-text - Tiny library for dynamic text hydrating with variables.
  • JS Image Carver - Content-aware image resizer and object remover based on Seam Carving algorithm.
  • Acorn-JSX - Alternative, faster React.js JSX parser.
  • Tempura - Light, crispy, and delicious template engine.
  • async-cache-dedupe - Async cache with dedupe support.
  • DOM to Image - Generates an image from a DOM node using HTML5 canvas.
  • Dinero.js - Create, calculate, and format money safely in JavaScript and TypeScript.
  • proxied-worker - Tiny utility to asynchronously drive a namespace exposed through a Worker.
  • FZF for JavaScript - Do fuzzy matching using FZF algorithm in JavaScript. (Web)
  • ganja.js - Geometric Algebra for JavaScript.
  • TextKit - Framework for creating Textual Graphics.
  • spacers - JS library that supports multiple spacers for controlling padding/margin, linking functionality & much more.
  • CCapture.js - Library to capture canvas-based animations.
  • All Origins - Pull contents from any page via API (as JSON/P or raw) and avoid Same-origin policy problems.
  • Univrse.js - Universal schema for data serialization, signing and encryption. (Web)
  • mississippi - Collection of useful stream utility modules for writing better code using streams.
  • TinyEvents - Tiny event utility library.
  • lightGallery - Lightweight, modular, JavaScript image and video lightbox gallery plugin. Available for React.js, Vue.js, Angular, and TypeScript. (Web)
  • Cropper.js - JavaScript image cropper. (Web)
  • JavaScript Cookie - Simple, lightweight JavaScript API for handling cookies.
  • Bisect - Bisect your async job into two steps, first perform work in background and then commit the work.
  • AG Grid - Best JavaScript Data Table for building Enterprise Applications. (Web)
  • events-to-async - Treat EventEmitter-like object using Async/Await and Async Iterator.
  • gfxrlz - Modern-styled, low-level graphics API for the web.
  • PCUI Graph - JavaScript library for creating node-based graphs.
  • Detect It - Detect if a device is mouseOnly, touchOnly, or hybrid, and if the primary input is mouse or touch. (Web)
  • zen-observable - Implementation of Observables for JavaScript.
  • has-pkg - Check if a package is installed locally.
  • js-lru - Fast, simple & universal Least Recently Used (LRU) map for JavaScript.
  • vscode-uri - URI implementation that is used in VS Code and its extensions.
  • Dotto.x - Tiny state manager for React, Svelte, and vanilla JS.
  • calendarize - Tiny (202B) utility to generate calendar views.
  • pdfAnnotate - JavaScript library for creating annotations in PDF documents.
  • Consola - Elegant Console Logger for Node.js and Browser.
  • ohmyfetch - Better fetch API. Works on node, browser and workers.
  • Tingle.js - Vanilla modal plugin, no dependencies and easy-to-use.
  • Borsh JS - TypeScript/JavaScript implementation of Binary Object Representation Serializer for Hashing.
  • set-value - Set nested properties on an object using dot-notation.
  • parquet.js - Fully asynchronous, pure JavaScript implementation of the Parquet file format.
  • jlottie - Small-footprint lottie player in JavaScript.
  • cosmiconfig - Find and load configuration from a package.json property, rc file, or CommonJS module.
  • Tocca.js - Super lightweight script ( ~1kB ) to detect via Javascript events like 'tap' 'longtap' 'dbltap' 'swipeup' 'swipedown' 'swipeleft' 'swiperight' on any kind of device.
  • fast-base64 - Fastest base64 on the web, with Wasm + SIMD.
  • Nano Colors - Tiny and fast Node.js library for formatting terminal text with ANSI colors. (Template) (HN) (Chalk maintainer's thoughts) (Tweet)
  • picocolors - 2x times faster than nanocolors and use 2x less space in node_modules. (Tweet)
  • yoctocolors - Smallest and fastest command-line coloring package on the internet. Trust me.
  • Fractional Indexing - Technique to create an ordering that can be used for Real time Editing of Ordered Sequences.
  • Atrament - Small JS library for beautiful drawing and handwriting on the HTML Canvas. (Web)
  • clipboardy - Access the system clipboard (copy/paste).
  • paintvec - JavaScript 2D vector math library.
  • Audio Recorder Polyfill - MediaRecorder polyfill to record audio in Edge and Safari.
  • IPO - Easing library allowing to describe complex easings in JSON.
  • JSXGraph - Dynamic Mathematics with JavaScript (Web) (HN)
  • Vector Graph - Generate high-quality geometry and vector graphs with HTML.
  • TweenTime - JavaScript timeline.
  • Micromodal.js - Tiny JavaScript library for creating accessible modal dialogs. (Docs)
  • Postal.js - JavaScript pub/sub library supporting advanced subscription features, and several helpful add-ons.
  • slugo - Smallest possible slug utility for Node.js and Browser.
  • Dry - Superset of the Liquid templating language, with first-class support for advanced inheritance features, and more.
  • Bloom-Filters - JS implementation of probabilistic data structures: Bloom Filter (and its derived), HyperLogLog, Count-Min Sketch, Top-K and MinHash.
  • Session Resume - Annotate fields to be persisted on navigation away from the current page.
  • Atropos - Lightweight, free and open-source JavaScript library to create stunning touch-friendly 3D parallax hover effects. (Web)
  • Graph Dracula - JavaScript Graph Library.
  • date-io - Abstraction over common JavaScript date management libraries.
  • sdf-csg - Generate meshes from signed distance functions and constructive solid geometry operations.
  • littlefoot - Lightweight JavaScript library that creates exceptional footnotes. (Web)
  • tzdb - Simplified, grouped and always up to date list of time zones, with major cities.
  • Lazyframe - Dependency-free library for lazyloading iframes.
  • msgpack-lite - Fast Pure JavaScript MessagePack Encoder and Decoder.
  • medium-zoom - JavaScript library for zooming images like Medium. (Web)
  • PureImage - Pure JS implementation of an image drawing and encoding api, based on HTML Canvas.
  • vanilla-hamburger - Animated hamburger menu icons for modern web apps. (Web)
  • editable.js - JavaScript API that defines a friendly and browser-consistent content editable interface.
  • Fireworks.js - Simple fireworks library.
  • module-error - Create errors with code and cause properties.
  • InfiniteGrid - Module used to arrange card elements including content infinitely on a grid layout. (Web)
  • Okiba - Sharp collection of tools for front-end development, created with performance in mind.
  • FastPriorityQueue.js - Fast heap-based priority queue in JavaScript.
  • Autobee - Multiwriter Hyperbee comprised of multiple input Hyperbees using Autobase and Hypercore 10.
  • std-env - Detect current JavaScript environment.
  • Nova Text Tools - Swiss Army knife for text manipulation and selection.
  • Ninja Keys - Keyboard shortcuts interface for your website. Working with static HTML, Vanilla JS, Vue, React, Svelte.
  • remoteStorage.js - JavaScript library for storing user data locally in the browser, as well as connecting to remoteStorage servers and syncing data across devices and applications. (Docs)
  • JS Data Structures
  • Oby - Tiny Observable implementation. (Tweet)
  • trkl - Reactive JavaScript programming in less than half a kilobyte.
  • Microdiff - Fast, zero dependency object and array comparison library. (HN) (Article)
  • lfi - Lazy functional iteration library supporting sync, async, and concurrent iteration.
  • Speed Highlight JS - Light, fast, and easy to use, dependencies free javascript syntax highlighter.
  • Proload - Searches for and loads your tool's JavaScript configuration files.
  • Sticksy.js - Zero-dependency JavaScript library that sticks your elements to the top until they reaching the bottom.
  • Async Tasks Runner - Super tiny (< 1kb gzipped), side-effect free, tree shakable, zero dependencies, and fully typed Tasks Runner.
  • ULID JS - Universally Unique Lexicographically Sortable Identifier.
  • Avsc - Avro for JavaScript.
  • msgpackr - Ultra-fast MessagePack implementation with extension for record and structural cloning.
  • Lib0 - Monorepo of isomorphic utility functions.
  • node-stdlib-browser - Node standard library for browser.
  • parse-json - Parse JSON with more helpful errors.
  • cuid - Collision-resistant ids optimized for horizontal scaling and performance.
  • Spacing JS - JavaScript utility for measuring the spacing between elements on webpage.
  • co-share - JavaScript library for easily building shared applications such as chats and games. (Tweet)
  • bellboy - Highly performant JavaScript data stream ETL engine.
  • fnv-plus - JavaScript FNV-1a Hash Algorithm (up to 1024 bit) implementation.
  • remote-web-streams - Web streams that work across web workers and iframes.
  • web-streams-adapter - Adapters for converting between different implementations of WHATWG Streams.
  • pan-zoom - Panning and zooming events for any target.
  • bind-event-listener - Utility to make binding and (especially) unbinding DOM events easier.
  • Chrono - Natural language date parser in JavaScript.
  • CAF - Cancelable Async Flows.
  • queue-microtask - Fast, tiny queueMicrotask shim for modern engines.
  • Cerbero - Simple js library that gives you the ability to track everything your users are doing on your web page.
  • Two.js - Renderer agnostic two-dimensional drawing api for the web. (Docs)
  • markup-it - JavaScript library to parse and serialize markup content (Markdown and HTML).
  • h3-js - JavaScript version of H3, a hexagon-based geospatial indexing system.
  • Floating UI - JavaScript positioning library for tooltips, popovers, dropdowns, and more. (Web) (Twitter)
  • flow-field - Library for generating flow fields.
  • taki - Take a snapshot of any website.
  • Zooming - Image zoom that makes sense.
  • Moo - Highly-optimized tokenizer/lexer generator. Use it to tokenize your strings, before parsing 'em with a parser.
  • deeplinks.js - Simple deep links to any selection of text on your website.
  • piecemeal - Send your data piecemeal.
  • stacktrace.js - Generate, parse, and enhance JavaScript stack traces in all web browsers.
  • double.js - Double-double arithmetic in JavaScript. A floating point expansion with 31 accurate decimal digits.
  • dotparser - Parser of GraphViz dot file format.
  • bitECS - Functional, minimal, data-oriented, ultra-high performance ECS library written using JavaScript TypedArrays.
  • ocean.js - JavaScript library to privately & securely publish, exchange, and consume data.
  • diagram-js - Toolbox for displaying and modifying diagrams on the web.
  • Swear - Flexible promise handling with JavaScript.
  • OpenSeadragon - Open-source, web-based viewer for zoomable images, implemented in pure JavaScript. (Web)
  • Atomically - Read and write files atomically and reliably.
  • point-in-polygon - Determine if a point is inside of a polygon.
  • Eruda - Console for Mobile Browsers. (Web)
  • fast-redact - Serializes an object with JSON.stringify, censoring any data at paths specified.
  • fast-safe-stringify - Safe and fast serialization alternative to JSON.stringify.
  • createContent - Cross browser utility to create HTML or SVG runtime content.
  • templite - Lightweight templating in 150 bytes.
  • ml-matrix - Matrix manipulation and computation library.
  • env-paths - Get paths for storing things like data, config, cache, etc.
  • Draggabilly - Make elements draggable.
  • flattie - Tiny (203B) and fast utility to flatten an object with customizable glue.
  • Zoomist - JavaScript library for zooming image.
  • canvas-capture - Record the canvas as an image, mp4 video, or GIF from the browser.
  • hardtack - Ultra-light library for working with cookies in JavaScript.
  • Eta - Embedded JS template engine for Node, Deno, and the browser. Lighweight, fast, and pluggable. Written in TypeScript. (Web)
  • Vanta JS - Animated 3D backgrounds for your website. (Web) (HN)
  • standardized-audio-context - Cross-browser wrapper for the Web Audio API which aims to closely follow the standard.
  • worker-timers - Replacement for setInterval() and setTimeout() which works in unfocused windows.
  • Swiper - Most modern mobile touch slider with hardware accelerated transitions. (Web)
  • flat - Flatten/unflatten nested JavaScript objects.
  • AMQP Node
  • Drawflow - Create data flows easily and quickly.
  • find-up - Find a file or directory by walking up parent directories.
  • Stretchy - Form element autosizing, the way it should be. (Code)
  • it-pipe - Utility to "pipe" async iterables together.
  • Polyglot.js - Give your JavaScript the ability to speak many languages.
  • merge-images - Easily compose images together without messing around with canvas.
  • Faker - Generate massive amounts of fake data in the browser and node.js.
  • FxJS - Functional Extensions for JavaScript.
  • dequal - Tiny utility to check for deep equality.
  • bin-wrapper - Binary wrapper that makes your programs seamlessly available as local dependencies.
  • base2048 - Binary encoding optimized for transmitting data through Twitter.
  • sube - Subscribe to any reactive source.
  • hm-def - Runtime type checking for JS with Hindley Milner signatures.
  • cRonstrue - JavaScript library that converts CRON expressions into human readable descriptions.
  • Hyperactiv - Super tiny reactive library.
  • JsonHilo.js - Fast lossless JSON parse event streaming, in JavaScript.
  • most - Ultra-high performance reactive programming.
  • expandify - Simple express.js tool to evaluate expressions in HTML templates.
  • remark-shiki - Highlight code blocks in markdown with shiki.
  • better-eval - Alternative to 'eval' in JavaScript that is customizable and safer.
  • resolve.exports - Tiny (737b), correct, general-purpose, and configurable "exports" resolver without file-system reliance.
  • Peggy - Parser generator for JavaScript. (Web)
  • zip.js - JavaScript library to zip and unzip files in the browser and Deno.
  • Data-oriented Serialization for SoA/AoS - Serialization library for data-oriented design structures.
  • node-ffmpeg-installer - Platform independent binary installer of FFmpeg for node projects.
  • Smoothie Charts - Small charting library designed for live streaming data.
  • tar-stream - Streaming tar parser and generator.
  • tar-fs - fs bindings for tar-stream.
  • get-stream - Get a stream as a string, buffer, or array.
  • pump - Pipe streams together and close all of them if one of them closes.
  • TogetherJS - Service for your website that makes it surprisingly easy to collaborate in real-time.
  • emoji-translate - Translate text to emoji.
  • peer-cdn - Lightweight library providing peer to peer CDN functionality.
  • magic-string - Manipulate strings like a wizard.
  • fdir - Fastest directory crawler & globbing library for NodeJS. Crawls 1m files in < 1s.
  • HLS.js - JavaScript library that plays HLS in browsers with support for MSE.
  • rec.la - Loopback domain and SSL certs.
  • to-json-schema - Converts JS objects to JSON Schema.
  • vercel/fetch - Opinionated fetch (with retrying and DNS caching) optimized for use inside microservices.
  • KeyboardJS - JavaScript library for binding keyboard combos without the pain of key codes and key combo conflicts.
  • Koder - QR/bar code scanner for the Browser.
  • cors-bypass - Bypass the browsers CORS restrictions, without needing to setup a server-side proxy.
  • rehype-raw - Plugin to parse the tree (and raw nodes) again, keeping positional info okay.
  • micromatch - Highly optimized wildcard and glob matching library.
  • BufferBackedObject - Buffer-backed objects in JavaScript.
  • curtains.js - Lightweight vanilla WebGL JavaScript library that turns HTML DOM elements into interactive textured planes.
  • Martinez-Rueda - Martinez-Rueda polygon clipping algorithm, does boolean operation on polygons.
  • actor - Library for managing concurrent effects using generators.
  • fast-json - Lightning fast on the fly JSON parser.
  • noble-hashes - Audited & minimal JS implementation of SHA2, SHA3, RIPEMD, BLAKE2/3, HMAC, HKDF, PBKDF2 & Scrypt.
  • sweetalert2 - Beautiful, responsive, highly customizable and accessible (WAI-ARIA) replacement for JavaScript's popup boxes. Zero dependencies.
  • openapi-client-axios - JavaScript client library for consuming OpenAPI-enabled APIs with axios.
  • Alias HQ - End-to-end solution for configuring, refactoring, maintaining and using path aliases.
  • record-cache - Cache optimized for record like things like host:port or domain.names.
  • UAParser.js - JavaScript library to detect Browser, Engine, OS, CPU, and Device type/model from User-Agent data with relatively small footprint.
  • p-lazy - Create a lazy promise that defers execution until it's awaited or when .then() or .catch() is called.
  • priority-queue - Performant heap-based priority queue implementation in JS.
  • Tiny-Swiper - JavaScript Carousel powered by wonderful plugins with native-like experience.
  • ga-lite - Smaller, cacheable subset of Google Analytics JS client.
  • lru-cache - Cache object that deletes the least-recently-used items.
  • XRegExp - Extended JavaScript regular expressions.
  • JSON Schema Faker - Use JSON Schema along with fake generators to provide consistent and meaningful fake data for your system.
  • observable-prerender - Pre-render Observable notebooks for automation.
  • Browser-FS-Access - File System Access API with legacy fallback in the browser.
  • js-libp2p-floodsub - Also known as pubsub-flood or just dumbsub, this implementation of pubsub focused on delivering an API for Publish/Subscribe, but with no CastTree Forming.
  • js-libp2p-tcp - JavaScript implementation of the TCP module that libp2p uses that implements the interface-transport spec.
  • Title - Service for capitalizing your title properly.
  • vercel-toast - Framework-agnostic vercel design's toast component.
  • color-convert - Plain color conversion functions in JavaScript.
  • Aurora.js - JavaScript audio decoding framework.
  • kappa-core - Minimal peer-to-peer database, based on kappa architecture.
  • Parcel's source-map - Fast source map manipulation, generation and consumption library written in Rust and Node.js.
  • imagesLoaded - JavaScript is all like "You images done yet or what?". (Web)
  • long.js - Long class for representing a 64-bit two's-complement integer value.
  • fast-jwt - Fast JSON Web Token implementation.
  • string-width - Get the visual width of a string - the number of columns required to display it.
  • apexcharts.js - Interactive JavaScript Charts built on SVG.
  • letMeScroll - Scroll made easy.
  • Flowed - Fast and reliable flow engine for orchestration and more uses in Node.js, Deno and the browser.
  • Zipson - JSON parse and stringify with compression.
  • text-field-edit - Insert text in a <textarea> and <input> (including Undo in most browsers).
  • Jump.js - Modern smooth scrolling library.
  • ringbuf.js - Wait-free thread-safe single-consumer single-producer ring buffer using SharedArrayBuffer.
  • Env - Utility for verifying that environment variables are present in Node.js and Deno.
  • devtools-detect - Detect if DevTools is open and its orientation.
  • clb - Small, utility function that builds a class list based on a simple API.
  • Compatto - Tiny and fast string compression library.
  • LemonadeJS - Micro (6Kb) reactive, with a two-way data binding, no dependencies, JavaScript library that aims to be as close to JavaScript Vanilla as possible.
  • undom - Minimally viable DOM Document implementation.
  • element-in-view - Check if an element is in viewport.
  • remark-directive - Remark plugin to support directives.
  • ffmpeg.js - Provides FFmpeg builds ported to JavaScript using Emscripten project.
  • Jison - API for creating parsers in JavaScript.
  • primitive-geometry - Geometries for 3D rendering, including normals, UVs and cell indices (faces).
  • many-level - Share an abstract-level database over the network or other kind of stream.
  • local-storage-proxy - Work with window.localStorage as if it were an object.
  • write-pkg - Write a package.json file.
  • KDBush - Fast static index for 2D points.
  • X6 - JavaScript diagramming library that uses SVG and HTML for rendering.
  • globby - User-friendly glob matching.
  • TreeModel - Manipulate and traverse tree-like structures in JavaScript.
  • fast-json-stable-stringify - Deterministic JSON.stringify.
  • loopbench - Benchmark your event loop.
  • Isomorphic Layout Composer (ILC) - Layout service that composes a web page from fragment services. It supports client/server-based page composition.
  • esx - High throughput React Server Side Rendering.
  • modern-async - Modern JavaScript tooling library for asynchronous operations using async/await, promises and async generators.
  • BSL - Body scroll locking that just works with everything.
  • flatqueue - Very fast and simple JavaScript priority queue.
  • Hasha - Hashing made simple. Get the hash of a buffer/string/stream/file.
  • json-tree - JS library that creates an HTML navigable tree from JSON object.
  • Easy Dates - Super lightweight library for working with dates.
  • multistream - Stream that emits multiple other streams one after another.
  • unified-language-server - Create a language server based on unified ecosystems.
  • ESQuery - ECMAScript AST query library.
  • Prexit - Graceful way to shutdown / handle process exit.
  • Codsen JS packages
  • Word Cloud Layout - Create word clouds in JavaScript.
  • encoding.js - Convert or detect character encoding in JavaScript.
  • Sugar High - Super lightweight JSX syntax highlighter, around 1KB after minified and gzipped.
  • jsperf.dev - Monorepo collection of JavaScript performance libraries.
  • flatstr - Flattens the underlying C structures of a concatenated JavaScript string.
  • ipaddr.js - IPv6 and IPv4 address manipulation library.
  • DataGridXL - Excel-like Experience for Web Apps. (Web) (HN)
  • rope-sequence - Persistent sequence data structure.
  • Wild Wild Path - Object property paths with wildcards and regexps.
  • get-dep-tree - Get a dependency tree for a package.
  • debugging-stream - Debug streams, by adding latency etc.
  • Simple Statistics - JavaScript implementation of descriptive, regression, and inference statistics.
  • Simple Linear Regression
  • Diff Match Patch - High-performance library in multiple languages that manipulates plain text.
  • Nitro - Build and deploy universal JavaScript servers.
  • Channel - Go-like channels for JavaScript.
  • big-json - Stream based implementation of JSON.parse and JSON.stringify.
  • FPO - FP library for JavaScript. Supports named-argument style methods.
  • cacheable-request - Wrap native HTTP requests with RFC compliant cache support.
  • pocket.io - Minimalistic version of socket.io that weights about 1K instead of 60K.
  • escape-goat - Escape a string for use in HTML or the inverse.
  • Template Parts - Implementation of the Template Parts proposal.
  • Iterators - Standard library iterator utilities.
  • MojiScript - Async-first, opinionated, and functional library.
  • destr - Faster, secure and convenient alternative for JSON.parse.
  • ensdomains/ui - Reusable functions and components for the ENS apps.
  • Golden Layout - Multi window layout manager for web apps.
  • nano-memoize - Faster than fast, smaller than micro ... nano-memoizer.
  • YAML - JavaScript parser and stringifier for YAML.
  • JW Player - Solution for seamless video playback across browsers and media types.
  • dgrid - Lightweight, mobile-ready, data-driven, modular grid widget designed for use with dstore. (Web)
  • SimpleBar - Custom scrollbars vanilla JavaScript library with native scroll, done simple, lightweight, easy to use and cross-browser.
  • PEG.js - Parser generator for JavaScript.
  • Yjs Protocols - Binary encoding protocols for syncing, awareness, and history information.
  • radix3 - Lightweight and fast router for JavaScript based on Radix Tree.
  • tinyqueue - Smallest and simplest binary heap priority queue in JavaScript.
  • protomux - Multiplex multiple message oriented protocols over a stream.
  • exifr - Fastest and most versatile JS EXIF reading library.
  • libhoney - Node.js module for sending events to Honeycomb, a service for debugging your software in production.
  • ejs - Embedded JavaScript templates.
  • Delaunator - Incredibly fast JavaScript library for Delaunay triangulation of 2D points.
  • unist-util-select - Utility to select unist nodes with CSS-like selectors.
  • Locomotive Scroll - Detection of elements in view port & smooth scrolling with parallax effects. (Code)
  • LiquidJS - Simple, expressive and safe template engine. (Web)
  • Piling.js - General framework and library for exploring thousands of small multiples. (Web)
  • Draggable - Get complete control over drag and drop behavior.
  • Cuberto Mouse Follower - Powerful JS library to create amazing and smooth effects for the mouse cursor on your website.
  • delegate-it - Lightweight event delegation.
  • ip-address - Library for validating and manipulating IPv4 and IPv6 addresses in JavaScript.
  • minimatch - Minimal matching utility.
  • Scroller - Fast, light-weight, and dependency-free content scroller.
  • Rambdax - Extended version of Rambda.
  • env-schema - Validate your env variable using Ajv and dotenv.
  • minipass - Minimal implementation of a PassThrough stream.
  • compile-json-stringify - Compile a JSON.stringify() function with type hints for maximum performance.
  • hanabi - Highlight any code, in a colorful way.
  • set-cookie-parser - Parse HTTP set-cookie headers in JavaScript.
  • el-transition - Apply Enter/Leave transitions.
  • webreflection/json-watch - Proxy based alternative to json-watch module.
  • AST Query - Simple JavaScript AST modification library.
  • Handlebars.js - Minimal templating on steroids.
  • collect.js - Convenient and dependency free wrapper for working with arrays and objects.
  • typeson.js - Preserves types over JSON, BSON or socket.io.
  • json2html - JavaScript library that uses js templates to render JSON objects into HTML.
  • json2csv - Converts JSON into CSV with column titles and proper line endings.
  • GLightbox - Pure JavaScript lightbox with mobile support. It can handle images, videos with autoplay, inline content and iframes.
  • Twig.js - JS implementation of the Twig Templating Language.
  • Atomic Agents - Spatial Agent-based Modeling in JavaScript.
  • is-online - Check if the internet connection is up.
  • wild-wild-utils - Functional utilities using object property paths with wildcards and regexps.
  • pattern-match-2d.js - Algorithm for fast 2D pattern-matching with wildcards.
  • reachable-url - Given an URL, it resolves as fast as possible, performing a GET without downloading the body.
  • urllib - Request HTTP(s) URLs in a complex world.
  • Bertin.js - JavaScript library for visualizing geospatial data and make thematic maps for the web.
  • EDTF.js - Extended Date Time Format (ISO 8601-2 / EDTF) Parser for JavaScript.
  • neodrag - Lightweight multi-framework libraries for draggability on the web.
  • object-hash - Generate hashes from JS objects in node and the browser.
  • Proxly - Proxy any list of objects or functions to a single entity.
  • nanoutils - Tiniest FP-friendly JavaScript utils library.
  • Slidy - Simple, configurable, nested & reusable sliding action script with templates, animations, easings & some useful plugins.
  • cloneable-readable - Clone a Readable stream, safely.
  • ASTq - Abstract Syntax Tree (AST) Query Engine. (HN)
  • virtual-scroll - Low-level library to create custom scroll behaviors.
  • lazyfill - Polyfills on demand.
  • retry - Abstraction for exponential and custom retry strategies for failed operations.
  • JointJS - Flexible JavaScript library for building interactive SVG-based diagrams and visual applications.
  • Toposort - Topologically sort directed acyclic graphs (such as dependency lists) in JS.
  • Pool - Like Promise.all but you can specify how many concurrent tasks you want at once.
  • Chokidar - Minimal and efficient cross-platform file watching library.
  • ky-universal - Use Ky in both Node.js and browsers.
  • 90's Cursor Effects - Old-school cursor effects for your browser built with modern JavaScript.
  • Spacetime - Lightweight JS timezone library.
  • ELK - ELK's layout algorithms for JavaScript.
  • multiaddr - JavaScript implementation of multiaddr.
  • file-type - Detect the file type of a Buffer/Uint8Array/ArrayBuffer.
  • rdflib.js - Linked Data API for JavaScript.
  • array-keyed-map - JS data structure, like Map, but the keys are arrays.
  • OpenTelemetry JavaScript - OpenTelemetry instrumentation for JavaScript modules.
  • OpenTelemetry API for JavaScript
  • Prolly Trees - Implementation of peer-to-peer search trees (probabalistic b-trees trees) as used in dolt and noms.
  • abcjs - JavaScript library for rendering standard music notation in a browser.
  • object-sizeof - Get size of a JavaScript object.
  • fmu - Collection of JS module utilities written in Rust.
  • Constrain - Responsive, animated figures in JavaScript/HTML canvases.
  • probe-image-size - Get image size without full download. Supported image types: JPG, GIF, PNG, WebP, BMP, TIFF, SVG, PSD, ICO.
  • nkeys.js - Public-key signature system based on Ed25519 for the NATS ecosystem system for JavaScript.
  • p-timeout - Timeout a promise after a specified amount of time.
  • safe-json-value - JSON serialization should never fail.
  • Config Array - Glob-based configuration array utility.
  • p-cancelable - Create a promise that can be canceled.
  • neat-csv - Fast CSV parser.
  • xdg-app-paths - Determine (XDG-compatible) paths for storing application files (cache, config, data, etc).
  • evemin - Modern and blazing fast event emitter.
  • Buffer for Array - Bridging the gap between buffers and typed arrays.
  • joycon - Find and load config files with joy.
  • SAT.js - Simple JavaScript library for performing 2D collision detection.