What is API Mock Server?
API Mock Server is a free online tool that creates mock REST APIs instantly, allowing you to simulate API endpoints without a backend. Define custom endpoints, response data, status codes, and headers for realistic API testing.
Built with modern web technologies, this tool operates entirely in your browser, enabling you to prototype and test frontend applications without server infrastructure or complex configurations.
Why Use API Mock Server?
This tool eliminates dependency on backend services during frontend development. Create realistic API responses, test error scenarios, and develop features in parallel without waiting for backend implementation.
Perfect for frontend developers, full-stack developers, QA engineers, and teams following API-first development who need to build and test applications with simulated API endpoints quickly.
Common Use Cases
Frontend Development: Build and test frontend features before backend APIs are ready with realistic mock data.
API Prototyping: Design and validate API structures, test different response formats, and demonstrate API behavior to stakeholders.
Error Testing: Simulate various HTTP status codes, error responses, and edge cases without modifying production APIs.
Integration Testing: Test API integrations, validate request handling, and ensure proper error handling with controlled mock responses.
How to Use API Mock Server
Define your API endpoints by specifying the path, HTTP method (GET, POST, PUT, DELETE), and response data. Configure status codes, headers, and response delays to simulate real-world scenarios.
Use the generated mock server URL in your application to make requests. The tool will respond with your configured data, allowing you to test frontend functionality without a real backend.