JSPM

The string_decoder module from Node core

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

Node.js Buffer API, for the browser

Array#isArray for older browsers

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

ES2015 `Object.assign()` ponyfill

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

Determine if an object is a Buffer

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

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

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

Public API for OpenTelemetry

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

Public logs API for OpenTelemetry

Lightweight browser detector

Universal WHATWG Fetch API for Node, Browsers and React Native

Microsoft Azure SDK for JavaScript - Aborter

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

JavaScript's functional programming helper library.

the path module from node core for browsers

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

the stream module from node core for browsers

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

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

Convert a typed array to a Buffer without a copy

Get the default browser

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

High performance (de)compression in an 8kB package

A simple, lightweight JavaScript API for handling cookies

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

HTML5 `FormData` for Browsers and Node.

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

JavaScript library for DOM operations

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

Random number generator for browsers and node.js

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

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

Parse and stringify URL query strings

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

https module compatability for browserify

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

Isomorphic implementation of WebSocket

JSON without touching any globals

timers module for browserify

Decode JWT tokens, mostly useful for browser applications.

Microsoft Azure SDK for JavaScript - Logger

Parse milliseconds into an object

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

node's constants module for the browser

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

the tty module from node core for browsers

Toggle current selected content in browser

vm module for the browser

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

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

A polyfill for the Resize Observer API

resolve which handles browser field support in package.json

Lazy assertions without performance penalty

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

Copy stuff into clipboard using JS with fallbacks

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

Promisify an event by waiting for it to be emitted

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

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

Microsoft Azure Storage SDK for JavaScript - Blob

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

Check if a value is a natural number

Cross-browser `CustomEvent` constructor

Tiny and elegant HTTP client based on the Fetch API

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

JavaScript SVG parser and renderer on Canvas.

Get a KeyboardEvent.key-style string from an event

OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

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

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.

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

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

Plugin for loglevel message prefixing

LRU and FIFO caches for Client or Server

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

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

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

Dynamic script loading for browser

Topological sort of directed acyclic graphs (like dependecy lists)

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

Isomorphic WebSocket

browser-side require() the node way

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

Serializes any DOM node into a String

DOMParser.parseFromString for XML with IE8 fallback

A tool to get browser's scrollbars width.

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

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

Simple JS stack with auto run for node and browsers

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

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

Tests if ES6 @@toStringTag is supported.

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

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

HKDF with no dependencies using runtime's native crypto

Isomorphic client library for Azure KeyVault's keys.

Extends Chai with assertions about promises.

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

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

Tests if ES6 Symbol is supported.

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

sort module-deps output for deterministic browserify bundles

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

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

A generated SDK for WebSiteManagementClient.

Browser compatibility data provided by MDN Web Docs

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

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

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!

XMLHttpRequest emulation for node.js

Analyze and debug space usage through source maps

Get the paths of edge browser easily

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

Detect device type and render your component according to it

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

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

Create a MD5 hash with hex encoding

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

Mouse wheel normalization across multiple multiple browsers.

Unpack a browser type and version from the useragent string

A client for working with the BrowserStack APIs.

Cross Platform implementation of the GitLab API

Array#filter for older browsers.

tap-producing test harness for node and browsers

OpenTelemetry instrumentation for fetch http client in web browsers

Simple JS queue with auto run for node and browsers

Check if mobile browser.

Node standard library for browser.

File manager plugin for CKEditor 5

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

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

A generated SDK for ResourceManagementClient.

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

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

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

Tiny local JSON database for Node, Electron and the browser

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

Minimal JavaScript module loader

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

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

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.

A Minimalistic Wrapper for IndexedDB

Isomorphic client library for Azure KeyVault's secrets.

Lint browser compatibility of API used

Javascript audio library for the modern web.

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

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

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

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

Browser fingerprinting library with the highest accuracy and stability

Browser port of the Node.js 'request' package

The official Fullstory browser SDK

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

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

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

Google's libphonenumber pre-compiled with the closure compiler

Logger Utils

Test whether value is error object

Lightweight copy to clipboard for the web

Environment utilities

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

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

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

Compress images in the browser

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

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

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

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

watch mode for browserify builds

strings comparison matchers for chai

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

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

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

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

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)

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

Auto mock all localstorage and sessionstorage APIs for your Jest tests

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

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.

UI utilities

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

Normalize browsers' default style

Chromium Binary for Serverless Platforms

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

provides locking mechanism to sync across browser tabs

Lint CSS for browser support against caniuse database

AWS X-Ray ID generator for OpenTelemetry

A pure JavaScript client for the tus resumable upload protocol

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

Check if browser is Internet Explorer

small function to append a query string to a URL

A companion library to openai for Azure OpenAI.

Populate a <canvas> element with a font texture atlas

Faro instrumentations, metas, transports for web.

<!-- markdownlint-disable MD024 -->

Extend Chai Assertion library with tests for http apis

Get the size of an element in pixels, including margins

Check if browser is Firefox

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

ExpressJS/Connect/TrinteJS user-agent middleware exposing

Faro web tracing implementation.

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

Cascading grid layout library

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

Mouse wheel normalization across multiple multiple browsers.

Check if a value is a `Blob`

tiny http client for Node and the browser

Chai plugin for JSON Schema v4

JavaScript barcode generator supporting over 100 types and standards.

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

Auth0 headless browser sdk

Fast client-side asset builder

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

Javascript string formatter for human readability

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

browserify compatible version of the ace editor.

Consistent cross browser mouse wheel movement

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

Advanced HTTP requests in node.js and browsers

memlab API

get webrtc browser methods unprefixed

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

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

Generic browser priority queue.

memlab browser E2E interaction libraries

Use Ky in both Node.js and browsers

A regular expression that matches a CHANGELOG filename

compute the bounding box of geojson features

An extremely fast, React-like JavaScript library for building modern user interfaces

insert a string of css into the <head>

Migrate older jQuery code to jQuery 3.0+

A generated SDK for ContainerInstanceManagementClient.

Emscripten distribution of libheif for Node.JS and the browser

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

Fingerprint Pro JavaScript agent

Automated browser testing for the modern web development stack.

Capture browser logs for logging in NodeJS

Event based JavaScript for the browser

Easy to use Node.js based end-to-end testing solution for web applications using the W3C WebDriver API.

AngularJS mocks for testing

A generated SDK for StorageManagementClient.