About Mock Server Config Generator

Generate stub responses from a JSON Schema. Part of the DevTools Surf developer suite. Browse more tools in the API / Config collection.

Use Cases

• Generate mock API responses for frontend development
• Create stub services for integration testing in CI
• Prototype API contracts before backend implementation begins
• Simulate third-party API responses during development

Tips

• Provide a JSON Schema to auto-generate stub responses
• Customize status codes and response headers in the config
• Use generated configs with mock server tools like WireMock

Fun Facts

• JSON Schema (draft-04) was first published in 2013, and the latest draft (2020-12) added features like $dynamicRef and unevaluatedProperties.
• Martin Fowler coined the term 'service virtualization' in 2011 to describe mock servers that simulate dependent services during testing.
• WireMock, one of the most popular mock server tools, was created by Tom Akehurst in 2012 and has been downloaded over 15 million times.

FAQ

What server format does it generate?

Config for common mock servers: json-server, Prism, wiremock. Pick based on which server you're running.

Does it pull from OpenAPI?

Yes — paste your OpenAPI 3 spec, get mock responses based on the schemas and examples. Prism works natively with OpenAPI.

Can I customize response delays?

Yes — add latency to simulate slow APIs. Useful for testing loading states and timeout handling.

Is this better than a hand-written stub?

For quick prototyping yes — generate from schema in seconds. For complex mock behavior (stateful, conditional) write the stub manually.