What is API Mock?
Turkish: API Mock
An API mock imitates expected endpoints and responses so frontend, mobile, and test teams can move before the real service is ready.
What is an API Mock?
An API mock is a fake service that imitates expected responses when the real API is not built or not available. Frontend, mobile, and test teams can call the same endpoints and work with representative data before the backend is complete.
Mock responses can come from static JSON files, vary by request parameter, or simulate latency and failure states. This makes it possible to test not only successful flows, but also 404, 429, 500, and validation-error scenarios.
Tools and Approaches
- Postman mock server: Creates quick test endpoints from collections.
- OpenAPI-based mock: Generates responses from schema examples.
- MSW or WireMock: Simulates service behavior in frontend and integration tests.
- Service virtualization: Emulates expensive or restricted enterprise systems.
Business Use
Mocks created with Postman or OpenAPI support parallel development. Design teams can validate interfaces, mobile teams can build screens, and QA teams can test error states without waiting for the real API.
The main risk is drift between the mock and the live API. Mock responses should be tied to contract tests, a current schema, or CI checks. Otherwise tests may pass while the production integration breaks.