Storybook

Vitest

vitest-dev/vitest

TrendingPopular

Vite-native test runner with a Jest-compatible API and real-browser mode; the default for new projects.

Playwright

microsoft/playwright

Trending (detected automatically)Popular

Microsoft's cross-browser end-to-end testing and automation framework; the E2E standard.

Jest

jestjs/jest

Popular

Long-standing JavaScript test runner with snapshots and mocking; still huge, though Vitest wins new projects.

Testing Library

testing-library/react-testing-library

Popular

User-centric DOM testing utilities for React, Vue, Angular and Svelte that query like users do.

Cypress

cypress-io/cypress

Developer-friendly E2E and component testing in a real browser with time-travel debugging.

MSW

mswjs/msw

Popular

Mock Service Worker: intercepts network requests to mock APIs in tests, Storybook and the browser.

Lighthouse

GoogleChrome/lighthouse

Google's automated auditing for performance, Core Web Vitals, accessibility and SEO.

jsdom

jsdom/jsdom

Popular

Pure-JS implementation of web standards used as the default simulated DOM for Jest and Vitest tests.

happy-dom

capricorn86/happy-dom

Trending (detected automatically)Rising

Fast JavaScript DOM implementation, a lighter and quicker alternative to jsdom for unit tests.