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Jest vs Vitest
Vitest is a Vite-powered unit test runner; Jest is framework-agnostic and more established.
Which to pick
Pick Jest if you want…
- Zero-config JavaScript testing
- General JavaScript testing
- Integrations with Babel, Node or React (on Jest's list, not Vitest's)
Pick Vitest if you want…
- Vite-native unit testing
- Integrations with Vite, Jest or JSX (on Vitest's list, not Jest's)
Jest is a mature, non-Vite-specific test runner; Vitest adds Vite integration and faster watch mode.
Side by side
- What it is
- Jest:Jest is a JavaScript testing framework that provides zero-config unit, snapshot, and coverage testing.
- Vitest:Vitest is a fast, Vite-native unit testing framework compatible with Jest and usable for both frontend and backend code.
- Best for
- Jest:Zero-config JavaScript testing
- Vitest:Vite-native unit testing
- Who it’s for
- Jest:JavaScript developers needing fast, reliable tests.
- Vitest:JavaScript/TypeScript developers using Vite or looking for Jest-compatible testing.
- Pricing
- Jest:Open source
- Vitest:Open source
- Open source
- Jest:Yes, 45,459 GitHub stars
- Vitest:Yes, 17,178 GitHub stars
- Works with
- Jest:Babel, TypeScript, Node, React, Angular, Vue
- Vitest:Vite, Jest, TypeScript, JSX, ESM
Jest features
- Zero config. Works out of the box on most JavaScript projects without needing configuration.
- Snapshot testing. Creates and compares snapshots of large objects inline or alongside tests.
- Parallel isolation. Runs tests in separate processes for maximum performance and reliable global state.
- Built-in code coverage. Generates coverage reports with the --coverage flag, no extra setup required.
- Easy mocking. Custom resolver and Mock Functions API let you mock imports and spy on calls easily.
- Rich assertions. Provides a comprehensive expect API with detailed failure messages.
Vitest features
- Vite integration. Reuses Vite's config and plugins for consistent testing environment.
- Jest compatibility. Supports Expect, snapshot, coverage and other Jest APIs for easy migration.
- Smart watch mode. Reruns only tests affected by code changes, similar to HMR.
- ESM/TS/JSX support. Out-of-the-box handling of ESM, TypeScript and JSX via Oxc.
- Backend testing. Can be used for non-Vite backend projects as a Jest-compatible runner.
- Open source. Free to use and community-maintained under an open-source license.
Jest vs Vitest FAQ
Is Jest or Vitest free?+
Yes, both are free and open source.
Is Jest or Vitest open source?+
Yes, both are open source: Jest (jestjs/jest on GitHub, MIT license) and Vitest (vitest-dev/vitest on GitHub, MIT license).
Do Jest and Vitest integrate with the same tools?+
Partly. Both list TypeScript. Jest also lists Babel, Node, React, Angular and 1 more; Vitest also lists Vite, Jest, JSX and ESM.
On DevHunt
Based on each tool's website and DevHunt data. Details may change; check the official sites.