Vitest integration

Last updated Aug 20, 2026 For most users, Cloudflare recommends using the Workers Vitest integration for unit testing Workers and Pages Functions projects. Vitest ↗︎ is a popular JavaScript testing framework featuring a fast watch mode, Jest compatibility, and default TypeScript support. Cloudflare provides the @cloudflare/vitest-plugin Vite plugin, which runs your Vitest tests inside the Workers runtime.

The Workers Vitest integration:

  • Supports both unit tests and integration tests.
  • Provides direct access to Workers runtime APIs and bindings.
  • Implements isolated per-test-file storage.
  • Runs tests fully-locally using Miniflare ↗︎.
  • Leverages Vitest's hot-module reloading for near instant reruns.
  • Supports projects with multiple Workers.

Write your first test

If you use @cloudflare/vitest-pool-workers, refer to Migrate to Vitest plugin.

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Vitest integration - 图1Docs

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description: Vitest configuration specific to the Workers integration. title: Configuration image: https://developers.cloudflare.com/workers/testing/vitest-integration/configuration/og.png?v=757cd9bbad5852dd

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