JSPM

tap-producing test harness for node and browsers

A client for working with the BrowserStack APIs.

A lightweight load testing tool using real browsers for streaming applications with DRM support

Element is a real browser load testing tool

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.

Extend Chai Assertion library with tests for http apis

Extends Chai with assertions about promises.

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

JavaScript library for DOM operations

the stream module from node core for browsers

This package contains Microsoft Azure LoadTestingClient client library.

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

Privacy-friendly conversion tracking and A/B testing script for UserTrax

memlab browser E2E interaction libraries

memlab API

A lightweight, fast browser module for converting HTML to PDF with advanced styling support, customizable options, and comprehensive testing

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

Automated Functional Testing (AFT) package supporting UI testing in browsers

Render React components in Vitest Browser Mode

Utilities.

An AI powered browser automation testing agent powered by LLMs.

Mocha tests in Electron.

[](https://percy.io/f1364dca/eBay-Skin)

Automated Functional Testing (AFT) package supporting UI testing in browsers with support for BrowserStack, Sauce Labs and Local Selenium Grid

Cypress.io end to end testing tool

Make End-to-End Testing Great for Once

A responsiveness testing tool on browsers

expressive server-side functional testing with jQuery and jsdom

A lightweight wrapper making assertion testing much easier.

The string_decoder module from Node core

A JavaScript testing framework for the real world

Adapter that integrates @serenity-js/web with Protractor, enabling Serenity/JS reporting and using the Screenplay Pattern to write end-to-end test scenarios

Provides a minified version of selected `@sa11y` libraries to be injected into a browser (using webdriver) and executed from integration testing workflows.

Array#isArray for older browsers

Adapter that integrates @serenity-js/web with Playwright, enabling Serenity/JS reporting and using the Screenplay Pattern to write component and end-to-end test scenarios

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

Auto mock all localstorage and sessionstorage APIs for your Jest tests

Cypress.io end to end testing tool

Node.js Buffer API, for the browser

Render Vue components in Vitest Browser Mode

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

Event based JavaScript for the browser

Modern and minimalist testing library for the web

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

ES2015 `Object.assign()` ponyfill

Automated browser testing for the modern web development stack.

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

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

A proper monster for front-end automated testing

Run TAP unit tests in 1789+ browsers

Determine if an object is a Buffer

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

Serenity/JS test runner adapter for Playwright Test, combining Playwright's developer experience with the advanced reporting and automation capabilities of Serenity/JS

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

All-in-one open source e2e testing framework, with low-code recorder, runner + batteries built-in.

Public API for OpenTelemetry

strings comparison matchers for chai

Render Svelte components in Vitest Browser Mode

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

Public logs API for OpenTelemetry

Utilities.

Use Ky in both Node.js and browsers

Flood Element is a browser based load generation tool for easily testing modern web application performance

Universal WHATWG Fetch API for Node, Browsers and React Native

Base class for node which OpenTelemetry instrumentation modules extend

JavaScript's functional programming helper library.

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

in memory localStorage polyfill for node.js utilizing ES6 proxies

Media-Mock is a JavaScript library that simulates media devices (like webcams) in web applications, allowing developers to test and debug media constraints, device configurations, and stream functionality without needing physical devices. This is particul

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

the path module from node core for browsers

Lightweight browser detector

High performance (de)compression in an 8kB package

A simple, lightweight JavaScript API for handling cookies

Convert a typed array to a Buffer without a copy

Microsoft Azure SDK for JavaScript - Aborter

A powerful command-line interface for automating Chrome browser using Playwright. Perfect for web scraping, automation, testing, and browser workflows.

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

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

HTML5 `FormData` for Browsers and Node.

Parse and stringify URL query strings

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

Random number generator for browsers and node.js

<!-- markdownlint-disable MD024 -->

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

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

Exports a jsdom window object.

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

Get the default browser

Utility for mocking XMLHttpRequest.

Super simple browser testing influenced by testling and smokestack

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.

Chai plugin for JSON Schema v4

https module compatability for browserify

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

Parse milliseconds into an object

E2E Testing Reinvented with AI - A powerful TypeScript browser automation framework using AI-powered testing with LangChain, OpenAI GPT-4o, and Playwright

JSON without touching any globals

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

Isomorphic implementation of WebSocket

timers module for browserify

Microsoft Azure SDK for JavaScript - Logger

the tty module from node core for browsers

node's constants module for the browser

vm module for the browser

A polyfill for the Resize Observer API

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

Collection of samples useful in testing IOTA modules.

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

Lazy assertions without performance penalty

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

Evaluate Javascript in PhantomJS, and print the output.

Toggle current selected content in browser

Promisify an event by waiting for it to be emitted

resolve which handles browser field support in package.json

Chromium binaries for Node.js projects

Copy stuff into clipboard using JS with fallbacks

Auto mock all localstorage and sessionstorage APIs for your Vitest tests

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

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

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

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

React Browser Tests is a browser first testing library. The tests are written in React and run in a browser. Terminal also works.

High Level DOM Assertions for QUnit

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

Get a KeyboardEvent.key-style string from an event

date / time comparison matchers for chai

OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

JavaScript SVG parser and renderer on Canvas.

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

Microsoft Azure Storage SDK for JavaScript - Blob

Tiny and elegant HTTP client based on the Fetch API

Check if a value is a natural number

Cross-browser `CustomEvent` constructor

Check if a value is an `Error` instance

(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.

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

DOM assertions for the Chai assertion library using vanilla JavaScript

Isomorphic WebSocket

Adapter that integrates @serenity-js/web with the latest stable version of WebdriverIO, enabling Serenity/JS reporting and using the Screenplay Pattern to write web and mobile test scenarios

The Backbone Framework

Detects where the current browser extension code is being run. Compatible with Firefox, Chrome and derivates.

UMD __dirname and __filename browser shim

The node.js assert module, re-packaged for web browsers.

LRU and FIFO caches for Client or Server

Spies for the Chai assertion library.

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

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.

Serializes any DOM node into a String

Topological sort of directed acyclic graphs (like dependecy lists)

Dynamic script loading for browser

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

An implementation of https://github.com/emberjs/rfcs/pull/726

browser-side require() the node way

Shallow deep equal assertion for chai

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

Plugin for loglevel message prefixing

HKDF with no dependencies using runtime's native crypto

DOMParser.parseFromString for XML with IE8 fallback

A tool to get browser's scrollbars width.

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

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

All-in-one open source e2e testing framework, with low-code recorder, runner + batteries built-in.

A framework for mocking the FileMaker webviewer window object for developing and testing fm webviewer apps in browser.

Tests if ES6 Symbol is supported.

Extends Chai with lint-friendly terminating assertions.

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)

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

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

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

sort module-deps output for deterministic browserify bundles

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

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

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

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

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

LambdaTest Rest Client for Node.js

A generated SDK for WebSiteManagementClient.

A browser and nodeJS compatible plugin that allows to generate GraphQL Queries and Variables

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

The simplest unit testing framework possible.

Get the paths of edge browser easily

Detect device type and render your component according to it

A mock browser with window, document, location, navigation, local and session storage to use for client side code tests in a node environment.

Smart IPFS gateway selector with latency testing and fallback logic (vanilla JS)

Unpack a browser type and version from the useragent string

Simple JS stack with auto run for node and browsers

Array#filter for older browsers.

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

XMLHttpRequest emulation for node.js

Simulates a global browser environment using jsdom

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!

JavaScript UI component for displaying audio waveforms

Browser compatibility data provided by MDN Web Docs

Node standard library for browser.

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

Analyze and debug space usage through source maps

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

A generated SDK for ResourceManagementClient.

A lightweight, flexible and based testing library for JS

Minimal JavaScript module loader

OpenTelemetry instrumentation for fetch http client in web browsers

Check if mobile browser.

CSS base styles

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

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

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

Create a MD5 hash with hex encoding

Tiny local JSON database for Node, Electron and the browser

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

File manager plugin for CKEditor 5

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

utilities for parsing shorthand Selenium capabilities objects

Mouse wheel normalization across multiple multiple browsers.

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

Isomorphic client library for Azure KeyVault's secrets.

Cross Platform implementation of the GitLab API

Lint browser compatibility of API used

A Minimalistic Wrapper for IndexedDB

Browser port of the Node.js 'request' package

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

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

Test whether value is error object

Browser fingerprinting library with the highest accuracy and stability

Simple JS queue with auto run for node and browsers

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

The official Fullstory browser SDK

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

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

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

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

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

A simple and small testing suite for javascript, both browser and node.js

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

the stream module from node core for browsers

Adapter that integrates @serenity-js/web with WebdriverIO 8, enabling Serenity/JS reporting and using the Screenplay Pattern to write web and mobile test scenarios

The #1 HTML sanitizer - 100% security success rate AND fastest performance. Outperforms DOMPurify, js-xss, bleach-js and all competitors in comprehensive testing.

Environment utilities

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.

Simple JS queue with auto run for node and browsers

Mixpanel Cordova Plugin for iOS, Android and Browser Platforms