Free Mock REST API Backend Generator Online
Generate instant mock REST API endpoints from JSON payloads. Perfect for frontend prototyping, testing, and simulating server latency.
Input
JSONOutput
API EndpointYour converted output will appear here
How to Use Free Mock REST API Backend Generator Online
Paste your desired JSON response. We generate a unique URL that returns your JSON. Use query params to simulate delays or errors.
🔒 Privacy First: This tool runs entirely in your browser. Your data never leaves your computer.
Common Use Cases
- Test frontend without a real backend
- Prototype API integrations quickly
- Simulate slow network conditions
- Test error handling in your app
Free Mock REST API Backend Generator Online FAQ
Paste your JSON, click Generate, and get a live URL that returns your JSON. The URL works for 24 hours with up to 5 API calls.
Yes! Add ?delay=2000 to your URL to add a 2 second delay. Great for testing loading states.
Yes! Add ?error=500 to simulate server errors, or ?error=404 for not found. Test your app's error handling easily.
Each mock endpoint allows 5 API calls, then expires. This prevents abuse while giving you enough for testing.