JavaScript Utilities

📝 Algorithms and data structures implemented in JavaScript with explanations and links to further readings

A web tool to explore the ASTs generated by various parsers.

Async utilities for node and the browser

🐦 ⚡ Bluebird is a full featured promise library with unmatched performance.

A promise library for JavaScript

The ultimate generator based flow-control goodness for nodejs (supports thunks, promises, etc)

A polyfill for ES6-style Promises

High-level streams library for Node.js and the browser

Cancelable Async Flows (CAF)

A Promise-based API for WebSockets

FP iterators that are both eager and asynchronous

Fullstack authentication and accounts-management for Javascript.

Auth0 headless browser sdk

Barcode generation library written in JavaScript that works in both the browser and on Node.js

A modern alternative to CSS resets

Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.

🦔 Share target browsers between different front-end tools, like Autoprefixer, Stylelint and babel-preset-env

a browser detector

Raw browser/feature support data from caniuse.com

A platform detection library.

Beautifier and language aware code comparison tool for many languages. It also minifies and a few other things.

A JavaScript library for efficient data fetching

JSON-Schema + fake data generators

Immutable persistent data collections for Javascript which increase efficiency and simplicity.

A JSON-like data structure (a CRDT) that can be modified concurrently by different users, and merged again automatically.

Protocol Buffers for JavaScript (& TypeScript).

Danfo.js is an open source, JavaScript library providing high performance, intuitive, and easy to use data structures for manipulating and processing structured data.

This package contains JavaScript implementations of common data structures with idiomatic interfaces.

A complete, fully tested and documented data structure library written in pure JavaScript.

The fastest JavaScript priority queue out there. Zero dependencies.

JavaScript k-d Tree Implementation

HashMap JavaScript class for Node.js and the browser. The keys can be anything and won't be stringified

TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

The repository for high quality TypeScript type definitions.

Adds static typing to JavaScript to improve developer productivity and code quality.

A collection of essential TypeScript types

Collection of utility types, complementing TypeScript built-in mapped types and aliases (think "lodash" for static types).

👷 TypeScript's largest type utility library

An advanced static type checker

yet another Typescript type library for advanced types

The Type Linter for JS

Runtime type checking for JS with Hindley Milner signatures

Parse, validate, manipulate, and display dates in javascript.

⏰ Day.js 2kB immutable date-time library alternative to Moment.js with the same modern API

⏳ Modern JavaScript date utility library ⌛️

⏱ A library for working with dates and times in JS

🕗 The original jQuery plugin that makes it easy to support automatically updating fuzzy timestamps (e.g. "4 minutes ago").

A lightweight javascript timezone library

A javascript library for defining recurring schedules and calculating future (or past) occurrences for them. Includes support for using English phrases and Cron schedules. Works in Node and in the browser.

🕑 Immutable date and time library for javascript

A Modern JavaScript Date Library

Visual connectivity for webapps

A Guides component that can draw ruler and manage guidelines.

A Ruler component that can draw grids and scroll infinitely.

Infinite Viewer is Document Viewer Component with infinite scrolling.

jQuery JavaScript Library

Zepto.js is a minimalist JavaScript library for modern browsers, with a jQuery-compatible API

Next-generation DOM manipulation

An absurdly small jQuery alternative for modern browsers.

☂ Lightweight javascript library for DOM manipulation and events

A tiny JavaScript micro-library

Reorderable drag-and-drop lists for modern browsers and touch devices. No jQuery or framework required.

👌 Drag and drop so simple it hurts

The JavaScript Drag & Drop library your grandparents warned you about.

JavaScript drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE9+)

👇 Make that shiz draggable

💌 mailgo, a new concept of mailto and tel links

Read and write OpenType fonts using JavaScript.

Self-host Open Source fonts in neatly bundled NPM packages.

Command line tool to optimize your webfont loading. Aggressive subsetting based on your font use, self-hosting of Google fonts and preloading

🐏 Practical functional Javascript

A functional and reactive JavaScript framework for predictable code

Functional programming in TypeScript

Functional reactive programming library for TypeScript and JavaScript

Like Underscore, but lazier

A library of dependency-free JavaScript functions that do just do one thing.

🙈 Refuge from unsafe JavaScript

🎨 The exhaustive Pattern Matching library for TypeScript, with smart type inference.

An extremely intuitive, small, and fast functional reactive stream library for JavaScript

Marble.js - functional reactive Node.js framework for building server-side applications, based on TypeScript and RxJS.

A Reactive Programming library for JavaScript

Pattern Matching for Javascript

The minimalistic but powerful, modular, functional reactive programming library in JavaScript.

The minimalistic but powerful, modular, functional reactive programming library in JavaScript.

A collection of well known Algebraic Data Types for your utter enjoyment.

FP iterators that are both eager and asynchronous

FP iterators that are both eager and asynchronous

Simple yet powerful live data computation framework

A modern JavaScript utility library delivering modularity, performance, & extras.

JavaScript's utility _ belt

🐏 Practical functional Javascript

💎  Convenient and dependency free wrapper for working with arrays and objects

A Javascript library for working with native objects.

A library of dependency-free JavaScript functions that do just do one thing.

Collection of useful React components

Blissful JavaScript

☂ Lightweight javascript library for DOM manipulation and events

Useful utility collection with zero dependencies

Modular JavaScript Utilities

A javascript library for multi-touch gestures :// You can touch this

JavaScript drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE9+)

Moveable! Draggable! Resizable! Scalable! Rotatable! Warpable! Pinchable! Groupable! Snappable!

A quick and powerful plugin for your pull-to-refresh needs in your webapp.

Super tiny size multi-touch gestures library for the web. 　　　You can touch this →

👇💥 JavaScript library for handling Force Touch, 3D Touch, and Pointer Pressure.

A library for prototyping realtime hand detection (bounding box), directly in the browser.

A JavaScript touch gesture detection library for the modern web

JavaScript keyword highlighting. Mark text with with options that fit every application. Also available as jQuery plugin.

i18next: learn once - translate everywhere

i18next: learn once - translate everywhere

A JavaScript Internationalization Framework

It's a small library to provide the I18n translations on the Javascript. It comes with Rails support.

Give your JavaScript the ability to speak many languages.

🌍📖 A readable, automated, and optimized (5 kb) internationalization for JavaScript

ICU MessageFormat for Javascript - i18n Plural and Gender Capable Messages

A general purpose internationalization library in 292 bytes

📜 Automatically add next page

Simple library for handling keyboard shortcuts in Javascript

A simple micro-library for defining and dispatching keyboard shortcuts. It has no dependencies.

➷ A robust Javascript library for capturing keyboard input. It has no dependencies.

A keyboard input capturing utility in which any key can be a modifier key.

A tiny (~400 B) & modern library for keybindings.

Trigger an action on an element with a keyboard shortcut.

A JavaScript library for binding keyboard combos without the pain of key codes and key combo conflicts.

A tiny, powerful and declarative wrapper around keyboard bindings in JavaScript

A javascript library for formatting and manipulating numbers.

Create, calculate, and format money in JavaScript and TypeScript.

A lightweight JavaScript library for number, money and currency formatting - fully localisable, zero dependencies.

A javascript library for handling currencies

autoNumeric is a standalone library that provides live as-you-type formatting for international numbers and currencies.

A JS library for number formatting

A Zero-dependency TypeScript/JavaScript financial library (based on numpy-financial) for Node.js, Deno and the browser

✈️ Easily create sites that work offline as well as online

Standalone parallax scrolling for mobile and desktop with CSS variables.

A library and language for building parsers, interpreters, compilers, etc.

📜 Extract meaningful content from the chaos of a web page

📜🔜🌲 Simple, fast, powerful parser toolkit for JavaScript.

A reactive programming library for JavaScript

Functional reactive programming library for TypeScript and JavaScript

Ultra-high performance reactive programming

Marble.js - functional reactive Node.js framework for building server-side applications, based on TypeScript and RxJS.

A Reactive Programming library for JavaScript