How do you mock API responses in Playwright tests?

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In Playwright, you can mock API responses using the route method to intercept network requests and provide custom responses. This is useful for isolating tests from backend dependencies or simulating various API scenarios.

Steps to Mock API Responses:

  1. Use page.route() – Intercepts matching requests.

  2. Define a handler – Return mocked data using route.fulfill().

Key Options in route.fulfill():

  • status: HTTP status code (e.g., 200, 404).

  • body: The response payload.

  • headers: Optional HTTP headers.

Tips:

  • Use wildcards like **/api/* to match multiple endpoints.

  • You can also use route.abort() to simulate failed requests.

  • Combine with page.waitForResponse() to ensure the app has handled the mocked request.

Mocking APIs in Playwright is powerful for creating reliable and fast tests by eliminating backend dependencies and enabling edge-case testing.

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