JSPM

The string_decoder module from Node core

Array#isArray for older browsers

Browser-friendly inheritance fully compatible with standard node.js inherits()

Node.js Buffer API, for the browser

Converts a source-map from/to different formats and allows adding/changing properties.

ES2015 `Object.assign()` ponyfill

Promise based HTTP client for the browser and node.js

The Node.js `util.deprecate()` function with browser support

Open stuff like URLs, files, executables. Cross-platform.

Public API for OpenTelemetry

Determine if an object is a Buffer

OpenTelemetry Core provides constants and utilities shared by all OpenTelemetry SDK packages.

An ES2015 mostly-spec-compliant `Reflect.getPrototypeOf` sham/polyfill/replacement that works in as many engines as possible

Base class for node which OpenTelemetry instrumentation modules extend

JavaScript's functional programming helper library.

Public logs API for OpenTelemetry

JWA, JWS, JWE, JWT, JWK, JWKS for Node.js, Browser, Cloudflare Workers, Deno, Bun, and other Web-interoperable runtimes

A library for parsing IPv4 and IPv6 IP addresses in node and the browser.

the path module from node core for browsers

Universal WHATWG Fetch API for Node, Browsers and React Native

Library to work against complex domain names, subdomains and URIs.

Convert a typed array to a Buffer without a copy

Better `os.arch()` for node and the browser -- detect OS architecture

Lightweight browser detector

Microsoft Azure SDK for JavaScript - Aborter

The assert module from Node.js, for the browser.

High performance (de)compression in an 8kB package

Detect Browser, Engine, OS, CPU, and Device type/model from User-Agent & Client Hints data. Supports browser & node.js environment

Check which JavaScript environment your code is running in at runtime: browser, Node.js, Bun, etc

JavaScript library for DOM operations

the stream module from node core for browsers

Get the bundle identifier of the default browser (macOS). Example: com.apple.Safari

A simple, lightweight JavaScript API for handling cookies

HTML5 `FormData` for Browsers and Node.

Parse and stringify URL query strings

Compare semver version strings to find greater, equal or lesser.

Get the default browser

atob for Node.JS and Linux / Mac / Windows CLI (it's a one-liner)

Minimal lightweight logging for JavaScript, adding reliable log level methods to any available console.log methods

Random number generator for browsers and node.js

Isomorphic implementation of WebSocket

timers module for browserify

Parse milliseconds into an object

A better opn. Reuse the same tab on Chrome for 👨‍💻.

node's constants module for the browser

Node's domain module for the web browser. This is merely an evented try...catch with the same API as node, nothing more.

Decode JWT tokens, mostly useful for browser applications.

resolve which handles browser field support in package.json

the tty module from node core for browsers

vm module for the browser

Toggle current selected content in browser

https module compatability for browserify

A polyfill for the Resize Observer API

JSON without touching any globals

Microsoft Azure SDK for JavaScript - Logger

Copy stuff into clipboard using JS with fallbacks

OpenTelemetry Collector Trace Exporter allows user to send collected traces to the OpenTelemetry Collector

An alias package for `crypto.randomBytes` in Node.js and/or browsers

Cypress is a next generation front end testing tool built for the modern web

Promisify an event by waiting for it to be emitted

Isomorphic client library for supporting long-running operations in node.js and browser.

OpenTelemetry Collector Metrics Exporter allows user to send collected metrics to the OpenTelemetry Collector

Lazy assertions without performance penalty

Converts a Web-API readable-stream into a Node.js readable-stream.

Get a KeyboardEvent.key-style string from an event

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. It includes many web standards from WHATWG DOM and HTML.

OpenTelemetry Zipkin Exporter allows the user to send collected traces to Zipkin.

btoa for Node.JS (it's a one-liner)

Framework-agnostic, micro-library for getting stack traces in all environments

OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

Apple's property list parser/builder for Node.js and browsers

JavaScript SVG parser and renderer on Canvas.

Tiny and elegant HTTP client based on the Fetch API

OpenTelemetry Collector Logs Exporter allows user to send collected logs to the OpenTelemetry Collector

Microsoft Azure Storage SDK for JavaScript - Blob

LRU and FIFO caches for Client or Server

Cross-browser `CustomEvent` constructor

🔥 An extremely fast and efficient LRU cache for JavaScript with high compatibility (including Browsers).

Check if a value is a natural number

Dynamic script loading for browser

browser-side require() the node way

React's ExecutionEnvironment module extracted for use in other packages & components

Serializes any DOM node into a String

(recursive)? merging of (cloned)? objects.

Low-Level OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

Lightweight and performant natural sorting of arrays and collections by differentiating between unicode characters, numbers, dates, etc.

Simple wrapper for cross-browser usage of the JavaScript Fullscreen API, which lets you bring the page or any element into fullscreen.

DOMParser.parseFromString for XML with IE8 fallback

A package that contains an array of every single file extension there is for binary files

A tool to get browser's scrollbars width.

A package that contains an array of every single file extension there is for text files

A JavaScript library to zip and unzip files in the browser, Deno and Node.js

HKDF with no dependencies using runtime's native crypto

Plugin for loglevel message prefixing

walk the dependency graph to generate json output that can be fed into browser-pack

Isomorphic WebSocket

sort module-deps output for deterministic browserify bundles

Tests if ES6 @@toStringTag is supported.

Isomorphic client library for Azure KeyVault's keys.

Check whether operating system CPU architecture is 64-bit or 32-bit (Supports browsers)

File manager plugin for CKEditor 5

Extends Chai with assertions about promises.

Determine if a filename and/or buffer is text or binary. Smarter detection than the other solutions.

Topological sort of directed acyclic graphs (like dependecy lists)

Extends Chai with assertions for the Sinon.JS mocking framework.

Tests if ES6 Symbol is supported.

A tiny (230B) and fast UUID (v4) generator for Node and the browser

Smallest/simplest possible means of using btoa with both Node and browserify

Array#filter for older browsers.

Unpack a browser type and version from the useragent string

Adds console.table method that prints an array of objects as a table in console

OpenTelemetry instrumentation for fetch http client in web browsers

Provides access to the system's web browser and supports handling redirects. On iOS, it uses SFSafariViewController or ASWebAuthenticationSession, depending on the method you call, and on Android it uses ChromeCustomTabs. As of iOS 11, SFSafariViewControl

XMLHttpRequest emulation for node.js

Creates an async iterator for a variety of inputs in the browser and node. Supports fetch, node-fetch, and cross-fetch

Flmngr file manager (Local disk / Amazon S3 / Azure Blob)

Check in which environment the code is running - browser/node.js/webworker/jsdom/deno

tap-producing test harness for node and browsers

Check if mobile browser.

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

Image structural similarity (SSIM). In TypeScript/JavaScript. For browser/server.

Get the paths of edge browser easily

pack node-style source files from a json stream into a browser bundle

Browser compatibility data provided by MDN Web Docs

Detect default web browser of the current user, cross-platform (Win/Lin/Mac)

Library to work against complex domain names, subdomains and URIs. Only contains ICANN section.

Detect device type and render your component according to it

Simple JS stack with auto run for node and browsers

A Minimalistic Wrapper for IndexedDB

Super light and fast Extensible ES6+ events and EventEmitters for Node and the browser. Easy for any developer level, use the same exact code in node and the browser. No frills, just high speed events!

Node standard library for browser.

A high-performance, lightweight LRU cache. Built for developers who need fast caching without compromising on features.

Minimal JavaScript module loader

A generated SDK for WebSiteManagementClient.

Light-weight EventEmitter (less than 1KB when gzipped)

Analyze and debug space usage through source maps

Create a MD5 hash with hex encoding

Smallest/simplest possible means of using atob with both Node and browserify

Cross Platform implementation of the GitLab API

Browser port of the Node.js 'request' package

Tiny local JSON database for Node, Electron and the browser

Mouse wheel normalization across multiple multiple browsers.

Promptbook: Turn your company's scattered knowledge into AI ready books

Isomorphic client library for Azure KeyVault's secrets.

HMAC-based (HOTP) and Time-based (TOTP) One-Time Password library

A client for working with the BrowserStack APIs.

`[].map(f)` for older browsers

Check version ranges like `>=N` and `X || Y || Z` with support for Node.js, Web Browsers, Deno, and TypeScript.

The speed of a single-page web application without having to write any JavaScript

Fastest, most accurate & effecient user agent string parser, uses Browserscope's research for parsing

Isomorphic client Runtime for Typescript/node.js/browser javascript client libraries generated using AutoRest

Give your JS App some Backbone with Models, Views, Collections, and Events.

Lint browser compatibility of API used

Browser fingerprinting library with the highest accuracy and stability

Test whether value is error object

Open a URL via the operating system (http: in default browser, mailto: in mail client etc.

Logger Utils

Detect Browser, Engine, OS, CPU, and Device type/model from User-Agent data. Supports browser & node.js environment

TaffyDB is an opensouce library that brings database features into your JavaScript applications.

An extended Error class that envelops a parent error, such that the stack trace contains the causation

Cross platform environment variables with process.env, window.name, location.hash and localStorage fallbacks

Simple JS queue with auto run for node and browsers

provides locking mechanism to sync across browser tabs

A generated SDK for ResourceManagementClient.

A function to get the scrolling parent of an html element.

strings comparison matchers for chai

watch mode for browserify builds

Environment utilities

The official Fullstory browser SDK

the part of vue-inbrowser-compiler-utils that contains no vue dependency

support for asynchronous development with a Promise based task Scheduler, several different Promise implementations (synchronous, idle, asynchronous and native runtime wrappers), await helpers, and aliases all built and tested using TypeScript.

AWS X-Ray ID generator for OpenTelemetry

Javascript audio library for the modern web.

Comprehensive TypeScript/JavaScript utility library with cross-environment support (Node.js, browser, web worker) providing helper functions, polyfills (ES5-ES2023), type checking utilities, and optimized implementations for better minification and code r

Oboe.js reads json, giving you the objects as they are found without waiting for the stream to finish

Detect default web browser of the current user, cross-platform (Win/Lin/Mac)

Manage unstructured data using DataSet. Add, update, and remove data, and listen for changes in the data.

Compress images in the browser

Google's libphonenumber pre-compiled with the closure compiler

Lightweight copy to clipboard for the web

Morph a DOM tree to another DOM tree (no virtual DOM needed)

Lightning fast hash functions for browsers and Node.js using hand-tuned WebAssembly binaries (MD4, MD5, SHA-1, SHA-2, SHA-3, Keccak, BLAKE2, BLAKE3, PBKDF2, Argon2, bcrypt, scrypt, Adler-32, CRC32, CRC32C, RIPEMD-160, HMAC, xxHash, SM3, Whirlpool)

Microsoft Azure Storage SDK for JavaScript - Queue

A modern logging library for Node.js and modern browsers that provides log level mapping to the console

A javascript scrollbar plugin that hides the native scrollbars, provides custom styleable overlay scrollbars, and preserves the native functionality and feel.

Lint CSS for browser support against caniuse database

Copy text to the clipboard in modern browsers (0.2 kB)

small function to append a query string to a URL

Extend Chai Assertion library with tests for http apis

Simple JS queue with auto run for node and browsers

An AI web browsing framework focused on simplicity and extensibility.

tiny http client for Node and the browser

Disallow features that are unsupported by the browsers that you are targeting

Automatically opens your browser and iOS Simulator to preview Node.js email messages sent with Nodemailer. Made for Forward Email and Lad. Cross-browser and cross-platform email testing.

Browser running for Vitest using playwright

Node's path builtin module exposed as dual ESM/CJS and browser-compatible out of the box.

A pure JavaScript client for the tus resumable upload protocol

Chai plugin for JSON Schema v4

JavaScript barcode generator supporting over 100 types and standards.

Chromium Binary for Serverless Platforms

Test'em 'scripts! Javascript Unit testing made easy.

Small module for fitting a canvas element within the bounds of its parent.

Get the size of an element in pixels, including margins

Check if browser is Firefox

Check if a value is a `Blob`

Auto mock all localstorage and sessionstorage APIs for your Jest tests

Emscripten distribution of libheif for Node.JS and the browser

A cross-browser wrapper for the Web Audio API which aims to closely follow the standard.

Normalize browsers' default style

A dynamic, browser-based visualization library.

It is a lightweight rest client for node.js and the browser

Check if browser is Internet Explorer

Tiny hashing module that uses the native crypto API in Node.js and the browser

UI utilities

browserify compatible version of the ace editor.

Consistent cross browser mouse wheel movement

Read `*.xlsx` files of moderate size in a web browser or on a server.

Render React components in Vitest Browser Mode

Mouse wheel normalization across multiple multiple browsers.

Faro instrumentations, metas, transports for web.

OpenFeature SDK for Web

Populate a <canvas> element with a font texture atlas

memlab browser E2E interaction libraries

Strictly typed EventTarget that directly extends EventTarget to function as a drop-in replacement. It works with all Event-Types and accounts for basically no additional bundle-size.

A regular expression that matches a CHANGELOG filename

Utility library to determine and normalize Element.scrollLeft behavior

Cross browser String#split implementation

Generic browser priority queue.

Copy to clipboard.

Give eachr an item to iterate (array, object or map) and an iterator, then in return eachr gives iterator the value and key of each item, and will stop if the iterator returned false.

Faro web tracing implementation.

insert a string of css into the <head>

Utilities to get and check variable types (isString, isPlainObject, isRegExp, etc)

Device detection (phone, tablet, desktop, mobile grade, os, versions)

<!-- markdownlint-disable MD024 -->

Javascript string formatter for human readability

Bitcoin Cash cashaddr address format support for Node.js and web browsers.

A jQuery plugin that adds cross-browser mouse wheel support.

A companion library to openai for Azure OpenAI.

Returns `true` if the Selection is "backward", `false` otherwise

JS Library & ExpressJS user-agent middleware exposing

Fast client-side asset builder

Library to work against complex domain names, subdomains and URIs.

React hooks done right, for browser and SSR.

Open stuff like URLs, files, executables. Cross-platform.

get webrtc browser methods unprefixed

Use Ky in both Node.js and browsers

A lightweight library to decode and verify RS JWT meant for the browser.

Auth0 headless browser sdk

Isomorphic/Universal WHATWG URL API with some support legacy node URL API