JSPM

Common utilities and helpers to make testing assertions easier

Cross browser testing for your ember-cli app using SauceLabs.

Easy e2e browser testing in Node

A universal testing suite that works with Mocha style test runners _and_ Node.js's built-in test runner.

a simple, full-featured, JavaScript testing framework

Playwright (Cross-browser testing framework) provider for Nest.js

A fake REST server that can run as a service or bundled within a browser, for testing and demoing

A powerful Jest + Puppeteer E2E testing framework with built-in device automation, data builders, and CLI

Bellini mocks for testing

A modern testing tool that makes Playwright easy to use with simple YAML syntax

Cypress.io end to end testing tool

async testing framework for es-modules

Template plugin for mocking and testing

Simple performance testing tool using SauceLabs

This method returns the index of the first element in the array that satisfies the provided testing function.

<div align="center"> <h1>Svelte Testing Library</h1>

Web console reporter for Mocha testing framework

minimal browser mocks for testing react-dom code in node.js

TAP reporters for zora testing library

Playwright utilities for testing and automation

A client for working with the BrowserStack APIs.

tap-producing test harness for node and browsers

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

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

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

memlab API

This package contains Microsoft Azure LoadTestingClient client library.

memlab browser E2E interaction libraries

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

Render React components in Vitest Browser Mode

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

Utilities.

An AI powered browser automation testing agent powered by LLMs.

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

Mocha tests in Electron.

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

A lightweight wrapper making assertion testing much easier.

expressive server-side functional testing with jQuery and jsdom

A JavaScript testing framework for the real world

The string_decoder module from Node core

Array#isArray for older browsers

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

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

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

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

Node.js Buffer API, for the browser

Auto mock all localstorage and sessionstorage APIs for your Jest tests

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

Event based JavaScript for the browser

Cypress.io end to end testing tool

ES2015 `Object.assign()` ponyfill

Render Vue components in Vitest Browser Mode

Modern and minimalist testing library for the web

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

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

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

Automated browser testing for the modern web development stack.

Determine if an object is a Buffer

A proper monster for front-end automated testing

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

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

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

strings comparison matchers for chai

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

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

Public logs API for OpenTelemetry

Run TAP unit tests in 1789+ browsers

Base class for node which OpenTelemetry instrumentation modules extend

Render Svelte components in Vitest Browser Mode

Public API for OpenTelemetry

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

Utilities.

the path module from node core for browsers

Use Ky in both Node.js and browsers

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

Lightweight browser detector

Convert a typed array to a Buffer without a copy

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

Microsoft Azure SDK for JavaScript - Aborter

Universal WHATWG Fetch API for Node, Browsers and React Native

High performance (de)compression in an 8kB package

JavaScript's functional programming helper library.

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

in memory localStorage polyfill for node.js utilizing ES6 proxies

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

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

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

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

Parse and stringify URL query strings

Get the default browser

Utility for mocking XMLHttpRequest.

A simple, lightweight JavaScript API for handling cookies

<!-- markdownlint-disable MD024 -->

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

Exports a jsdom window object.

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

Super simple browser testing influenced by testling and smokestack

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

HTML5 `FormData` for Browsers and Node.

https module compatability for browserify

Random number generator for browsers and node.js

JSON without touching any globals

Decode JWT tokens, mostly useful for browser applications.

node's constants module for the browser

Isomorphic implementation of WebSocket

Parse milliseconds into an object

timers module for browserify

Chai plugin for JSON Schema v4

the tty module from node core for browsers

vm 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.

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

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

A polyfill for the Resize Observer API

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

Toggle current selected content in browser

Lazy assertions without performance penalty

Copy stuff into clipboard using JS with fallbacks

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

Microsoft Azure SDK for JavaScript - Logger

Collection of samples useful in testing IOTA modules.

Chromium binaries for Node.js projects

Promisify an event by waiting for it to be emitted

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

resolve which handles browser field support in package.json

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

Auto mock all localstorage and sessionstorage APIs for your Vitest tests

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

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

Evaluate Javascript in PhantomJS, and print the output.

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

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

High Level DOM Assertions for QUnit

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

Get a KeyboardEvent.key-style string from an event

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

date / time comparison matchers for chai

OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

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

Microsoft Azure Storage SDK for JavaScript - Blob

Cross-browser `CustomEvent` constructor

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

Check if a value is a natural number

Tiny and elegant HTTP client based on the Fetch API

Check if a value is an `Error` instance

Isomorphic WebSocket

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

Spies for the Chai assertion library.

JavaScript SVG parser and renderer on Canvas.

LRU and FIFO caches for Client or Server

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

DOM assertions for the Chai assertion library using vanilla JavaScript

The Backbone Framework

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

Serializes any DOM node into a String

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

UMD __dirname and __filename browser shim

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.

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

Topological sort of directed acyclic graphs (like dependecy lists)

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

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

Shallow deep equal assertion for chai

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

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

Plugin for loglevel message prefixing

Extends Chai with lint-friendly terminating assertions.

A tool to get browser's scrollbars width.

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

Dynamic script loading for browser

HKDF with no dependencies using runtime's native crypto

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

Tests if ES6 @@toStringTag is supported.

browser-side require() the node way

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

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

DOMParser.parseFromString for XML with IE8 fallback

Isomorphic client library for Azure KeyVault's keys.

Tests if ES6 Symbol is supported.

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

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

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

Array#filter for older browsers.

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

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.

sort module-deps output for deterministic browserify bundles

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

XMLHttpRequest emulation for node.js

Unpack a browser type and version from the useragent string

Simple JS stack with auto run for node and browsers

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

The simplest unit testing framework possible.

Simulates a global browser environment using jsdom

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

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

Browser compatibility data provided by MDN Web Docs

A generated SDK for WebSiteManagementClient.

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

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

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

Create a MD5 hash with hex encoding

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!

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

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

Detect device type and render your component according to it

Get the paths of edge browser easily

A generated SDK for ResourceManagementClient.

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

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

Minimal JavaScript module loader

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

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

CSS base styles

Tiny local JSON database for Node, Electron and the browser

Cross Platform implementation of the GitLab API

LambdaTest Rest Client for Node.js

Mouse wheel normalization across multiple multiple browsers.

utilities for parsing shorthand Selenium capabilities objects

JavaScript UI component for displaying audio waveforms

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

OpenTelemetry instrumentation for fetch http client in web browsers

A lightweight, flexible and based testing library for JS

Browser port of the Node.js 'request' package

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

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

Check if mobile browser.

Test whether value is error object

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

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

File manager plugin for CKEditor 5

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

A Minimalistic Wrapper for IndexedDB