---
description: Run unit and integration tests for Cloudflare Workers inside the Workers runtime using the Vitest integration.
title: Vitest integration
image: https://developers.cloudflare.com/og-docs.png
---

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> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/workers/llms.txt  
> Use this file to discover all available pages before exploring further.

# Vitest integration

Last updated Aug 24, 2026|Copy as Markdown| [View as Markdown](https://0f4bf0fb.previews.developers.cloudflare.com/workers/testing/vitest-integration/index.md)| [Agent setup](https://0f4bf0fb.previews.developers.cloudflare.com/agent-setup/)

For most users, Cloudflare recommends using the Workers Vitest integration for unit testing Workers and [Pages Functions](https://0f4bf0fb.previews.developers.cloudflare.com/pages/functions/) projects. [Vitest ↗](https://vitest.dev/) is a popular JavaScript testing framework featuring a very fast watch mode, Jest compatibility, and out-of-the-box support for TypeScript. In this integration, Cloudflare provides a custom pool that allows your Vitest tests to run *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 ↗](https://miniflare.dev/).
- Leverages Vitest's hot-module reloading for near instant reruns.
- Supports projects with multiple Workers.

[Write your first test](https://0f4bf0fb.previews.developers.cloudflare.com/workers/testing/vitest-integration/write-your-first-test/)

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