Standing up a fake version of an API that returns canned or configurable responses — lets frontend, mobile, or downstream service teams develop in parallel with the real backend or test edge cases that are hard to reproduce live.
API Mocks come in flavors: static (return fixed JSON), dynamic (return responses based on request input), recorded (replay captured real traffic). Tools include Postman Mock Servers, Mockoon, Mockaroo, WireMock, and MSW (browser-side). Mock APIs let frontends ship before the backend exists, let QA test error states that don't naturally happen, and let CI tests run without depending on flaky third-party services.
Building a React frontend against a Mockoon mock that returns 30 customer records, then swapping to the real Django API when it's ready — no code changes.
API Mocking removes 'waiting for the backend' as the most common cause of frontend delivery delays — parallel development is dramatically faster than sequential.
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