Lighthouse

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.

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.

axe-core

dequelabs/axe-core

Popular

Deque's accessibility rules engine behind most a11y tooling, with Playwright, Cypress and Jest integrations.

eslint-plugin-jsx-a11y

jsx-eslint/eslint-plugin-jsx-a11y

Popular

ESLint rules that statically flag accessibility problems in JSX, included in most React configs.