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

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

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

Determine if an object is a Buffer

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

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

Public API for OpenTelemetry

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

Public logs API for OpenTelemetry

Base class for node which OpenTelemetry instrumentation modules extend

the path module from node core for browsers

JavaScript's functional programming helper library.

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

Universal WHATWG Fetch API for Node, Browsers and React Native

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

Lightweight browser detector

Microsoft Azure SDK for JavaScript - Aborter

Convert a typed array to a Buffer without a copy

High performance (de)compression in an 8kB package

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

JavaScript library for DOM operations

the stream module from node core for browsers

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

Parse and stringify URL query strings

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

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

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

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

Get the default browser

A simple, lightweight JavaScript API for handling cookies

HTML5 `FormData` for Browsers and Node.

Decode JWT tokens, mostly useful for browser applications.

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

Parse milliseconds into an object

Random number generator for browsers and node.js

https module compatability for browserify

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

Isomorphic implementation of WebSocket

node's constants module for the browser

JSON without touching any globals

the tty module from node core for browsers

timers module for browserify

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

vm module for the browser

A polyfill for the Resize Observer API

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

Lazy assertions without performance penalty

Toggle current selected content in browser

Copy stuff into clipboard using JS with fallbacks

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

Promisify an event by waiting for it to be emitted

Microsoft Azure SDK for JavaScript - Logger

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

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

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

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

resolve which handles browser field support in package.json

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

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

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

Get a KeyboardEvent.key-style string from an event

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

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

OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

Microsoft Azure Storage SDK for JavaScript - Blob

Check if a value is a natural number

Cross-browser `CustomEvent` constructor

Tiny and elegant HTTP client based on the Fetch API

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

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

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

JavaScript SVG parser and renderer on Canvas.

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.

LRU and FIFO caches for Client or Server

Isomorphic WebSocket

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

Serializes any DOM node into a String

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

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

🔥 An extremely fast and efficient LRU cache for JavaScript with high compatibility (including Browsers) — 6.8KB.

Topological sort of directed acyclic graphs (like dependecy lists)

Dynamic script loading for browser

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

HKDF with no dependencies using runtime's native crypto

A tool to get browser's scrollbars width.

Plugin for loglevel message prefixing

browser-side require() the node way

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

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

Tests if ES6 Symbol is supported.

DOMParser.parseFromString for XML with IE8 fallback

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)

Extends Chai with assertions about promises.

Simple JS stack with auto run for node and browsers

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

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

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

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

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

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

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!

sort module-deps output for deterministic browserify bundles

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

Unpack a browser type and version from the useragent string

A generated SDK for WebSiteManagementClient.

XMLHttpRequest emulation for node.js

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

Array#filter for older browsers.

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

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

Node standard library for browser.

Browser compatibility data provided by MDN Web Docs

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

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

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

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

A generated SDK for ResourceManagementClient.

Get the paths of edge browser easily

Analyze and debug space usage through source maps

Detect device type and render your component according to it

Tiny local JSON database for Node, Electron and the browser

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

Minimal JavaScript module loader

Simple JS queue with auto run for node and browsers

tap-producing test harness for node and browsers

OpenTelemetry instrumentation for fetch http client in web browsers

A client for working with the BrowserStack APIs.

Check if mobile browser.

Mouse wheel normalization across multiple multiple browsers.

Create a MD5 hash with hex encoding

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

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

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

Cross Platform implementation of the GitLab API

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

File manager plugin for CKEditor 5

Browser port of the Node.js 'request' package

Test whether value is error object

A Minimalistic Wrapper for IndexedDB

Promptbook: Run AI apps in plain human language across multiple models and platforms

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

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

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

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

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

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

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

Simple JS queue with auto run for node and browsers

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.

Isomorphic client library for Azure KeyVault's secrets.

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

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

Lint browser compatibility of API used

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

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

watch mode for browserify builds

strings comparison matchers for chai

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

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

Javascript audio library for the modern web.

Browser fingerprinting library with the highest accuracy and stability

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

The official Fullstory browser SDK

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

Google's libphonenumber pre-compiled with the closure compiler

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

Logger Utils

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)

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

Lightweight copy to clipboard for the web

Environment utilities

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

Compress images in the browser

A pure JavaScript client for the tus resumable upload protocol

Lint CSS for browser support against caniuse database

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

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

Normalize browsers' default style

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

provides locking mechanism to sync across browser tabs

Microsoft Azure Storage SDK for JavaScript - Queue

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

Extend Chai Assertion library with tests for http apis

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

AWS X-Ray ID generator for OpenTelemetry

Auto mock all localstorage and sessionstorage APIs for your Jest tests

small function to append a query string to a URL

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

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

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.

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

Faro instrumentations, metas, transports for web.

UI utilities

Chromium Binary for Serverless Platforms

Check if a value is a `Blob`

Populate a <canvas> element with a font texture atlas

tiny http client for Node and the browser

browserify compatible version of the ace editor.

Consistent cross browser mouse wheel movement

<!-- markdownlint-disable MD024 -->

Get the size of an element in pixels, including margins

Check if browser is Firefox

Cascading grid layout library

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

Check if browser is Internet Explorer

Mouse wheel normalization across multiple multiple browsers.

A companion library to openai for Azure OpenAI.

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

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

Chai plugin for JSON Schema v4

JavaScript barcode generator supporting over 100 types and standards.

Automated browser testing for the modern web development stack.

Advanced HTTP requests in node.js and browsers

Faro web tracing implementation.

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

Read small to medium `*.xlsx` files in a browser or Node.js. Parse to JSON with a strict schema.

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

ExpressJS/Connect/TrinteJS user-agent middleware exposing

Render React components in Vitest Browser Mode

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

A regular expression that matches a CHANGELOG filename

Copy to clipboard.

A generated SDK for ContainerInstanceManagementClient.

insert a string of css into the <head>

memlab browser E2E interaction libraries

Generic browser priority queue.

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

return all coordinates from a geojson object

React hooks done right, for browser and SSR.

Fast client-side asset builder

Auth0 headless browser sdk

Emscripten distribution of libheif for Node.JS and the browser

Javascript string formatter for human readability

Base draggable class

AngularJS mocks for testing

memlab API

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.

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.

Cross browser String#split implementation

React component to wrap your application or component in an iFrame for encapsulation purposes

Utility library to determine and normalize Element.scrollLeft behavior

Capture browser logs for logging in NodeJS

a geographic extent object