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API Design

API Mocking

/eɪ piː aɪ ˈmɒkɪŋ/

Definition

Creating a simulated API that returns predefined responses — used by frontend teams to develop before the real API is ready.

Example in context

"MSW (Mock Service Worker) intercepts fetch calls in the browser — the frontend team tests with mocked API responses."

Related terms

  • Mock — A fake object replacing a real dependency in tests, with configurable return values and call verification.
  • Stub — A simplified replacement for a real object that returns predefined responses — simpler than a mock, no verification.
  • Contract testing — Testing that verifies services interact according to a shared contract without deploying all services together.

Practice this term

Master API Mocking in context by working through exercises in the API Design module. You'll see the term used in real engineering scenarios with multiple-choice, fill-in-the-blank, and matching drills.

Practice in exercises → Browse all words