MockAPI Dog

Key Features

• •No signup required: Start building immediately without any authentication or registration, eliminating the barrier to entry for developers who need quick mock APIs.
• •All HTTP methods support: Simulate any server request with GET, POST, PUT, DELETE, PATCH, HEAD, and OPTIONS methods, allowing comprehensive testing of client-side interactions.
• •LLM streaming support: Mock OpenAI, Anthropic, and generic streaming formats with customizable token generation, enabling AI chatbot UI development without real API costs.
• •Custom status codes: Set HTTP status codes like 200, 201, 400, 404, or 500 to test how your application handles different server responses and error states.
• •JSON editor with syntax highlighting: Write and validate response body JSON directly in the browser with built-in syntax highlighting and validation for error-free configuration.
• •Delay simulation: Add artificial network delays to mock endpoints to test how your app behaves under slow network conditions or server latency.
• •Error testing: Configure random failure rates and conditional errors based on request headers to simulate unpredictable server behavior and improve application resilience.
• •CORS enabled: Cross-origin requests from any domain are supported, making it easy to use mock endpoints from frontend applications without configuration.

Use Cases

• •Testing AI chatbot integration: Build and test your AI chatbot UI with mock LLM streaming responses before connecting to expensive production APIs, saving money during development while ensuring a smooth user experience.
• •Testing error handling: Create endpoints that return 404, 500, or other error status codes to verify that your application handles failures gracefully, preventing crashes in production.
• •Building without backend: Focus on frontend development while the backend is still being built by using mock endpoints; replace them with real ones later without changing your code.
• •Workshop and training: Provide students with consistent, reliable API endpoints for learning exercises without infrastructure overhead, ensuring a smooth educational experience.
• •Rapid prototyping: Quickly validate product ideas and demonstrate concepts by creating mock APIs on the fly, accelerating the iterative design process.
• •CI/CD testing: Use stable mock endpoints in automated test suites to ensure consistent, repeatable tests without relying on live APIs or databases.

Who is this for?

Frontend developers who need to build and test UIs without waiting for backend APIs. AI/LLM engineers integrating ChatGPT, Claude, or custom models who want to avoid burning API credits during development. API testers and QA professionals requiring controlled error scenarios and delay simulations for resilience testing. Rapid prototypers validating product ideas and demonstrating concepts quickly. Educators and students learning web development or API integration who need reliable, no-setup mock endpoints. CI/CD engineers requiring stable mock endpoints for automated testing pipelines.