JSON Stringify
Validate, format and compact JSON before creating a mock.
Open Tool →Developer mock tool
JSON Mock API Generator
Describe a mock endpoint, paste its JSON response and generate a portable configuration, fetch example and MSW handler. Simulate success, error and delayed responses before wiring up a backend.
Configure the mock endpoint
The tool creates code and configuration only—it does not publish a hosted endpoint.
Run a simulation to preview the HTTP response.
JSON mock API FAQ
Does this publish a hosted API endpoint?
No. It creates a configuration and code snippets for local development, tests and prototypes.
Can I test failures and latency?
Yes. Pick a success or error status plus a delay up to two seconds, then run the simulation.
What is the MSW output?
It is a handler for Mock Service Worker, a popular API mocking library for browser and Node.js tests.