Mock Service Worker

Open-source API mocking library for writing client-agnostic mocks reusable across frameworks and environments.

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An open-source, free JavaScript API mocking library, Mock Service Worker uses the Fetch API and service worker integration to create client-agnostic request and response handlers. It helps frontend developers, test engineers, and component authors keep local development and tests reliable when backends are unavailable or changing by allowing the same mocks to be reused across environments and tools such as Vitest, Playwright, Storybook, and React Native.

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