1. What an API Mock Server Is An API Mock Server is a system that pretends to be a real API . Instead of connecting to a live backend, your application sends requests to the mock server and receives predefined responses . These responses look like real API data: JSON objects HTTP status codes Headers Error messages Delays But nothing is actually processed in a database or business system. The mock server simulates behavior , not real logic. In simple terms A real API = does real work A mock API = acts like it does real work Both speak the same language (HTTP + JSON), but only one is real. 2. Why API Mock Servers Exist Modern software is built from many moving parts : Frontend apps Mobile apps Microservices Third-party APIs Internal systems These parts are rarely ready at the same time. An API mock server exists to solve this problem. The main reasons Parallel development Frontend and backend teams can work at the same time. Earl...