Playwright

Vitest

vitest-dev/vitest

TrendingPopular

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

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.

Storybook

storybookjs/storybook

Popular

Workshop for building, documenting and testing UI components in isolation.

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.

Selenium

SeleniumHQ/selenium

Popular

W3C WebDriver-based browser automation with bindings for every major language and a huge grid ecosystem.

Puppeteer

puppeteer/puppeteer

Popular

Node library from Chrome for controlling Chrome and Firefox via DevTools Protocol and WebDriver BiDi.