Jest: mature, huge ecosystem, Facebook-backed, default for CRA. Vitest: uses Vite for fast test execution (10-20x faster), ESM-native, compatible with Jest API (easy migration), growing rapidly. For new Vite/Next.js projects: Vitest. For existing Jest codebases: stay with Jest unless speed is a bottleneck. Both support: TypeScript, mocking, snapshots, code coverage. Vitest is the testing framework of choice for new projects in 2025-2026.
comparison2 min read
Vitest vs Jest
Compare Vitest and Jest for JavaScript testing in 2025-2026.
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