WireMock
WireMock is a flexible open-source tool for mocking HTTP-based APIs, enabling developers to simulate backend services for testing and development purposes. It allows you to create stubs for API endpoints, define request matching rules, and simulate various HTTP responses, including delays and errors. It is commonly used in microservices architectures and integration testing to isolate components and test interactions without relying on real external services.
Developers should learn WireMock when building or testing applications that depend on external APIs, as it helps create reliable and controlled test environments by mocking those dependencies. It is particularly useful for unit and integration testing in microservices, enabling tests to run independently of external service availability or performance. Use cases include simulating API failures, testing edge cases, and developing front-end or client applications before backend services are fully implemented.