API Mock Generator
FreeGenerate mock REST API endpoints with fake JSON responses
About API Mock Generator
Front-end work shouldn't stall just because the backend isn't ready, what you need is a mock REST endpoint returning realistic JSON so the UI has something to talk to. This generator creates mock API endpoints with fake JSON responses, letting you build and test against believable data while the real service is still in progress.
Describe the response shape and the tool produces mock endpoints serving fake JSON so your client code can fetch, render, and handle data immediately. It's ideal for prototyping, demos, and testing loading and error states. The tool is free, runs in your browser without an account, and gives you ready-to-use mock responses so front-end and back-end work can proceed in parallel.
Common uses
- Stand up a mock endpoint so front-end work can start before the API exists
- Generate fake JSON responses to test list rendering and pagination
- Prototype data-driven UI and demos without a live backend
- Test loading, empty, and error states against predictable mock data
How to use
- 1
Configure options
Set your preferences using the options panel below.
- 2
Click Generate
Click the process button to generate your result instantly.
- 3
Copy or download
Copy the result to clipboard or download it directly to your device.
Why ToolHub?
- Instant generation
- Copy-ready output
- No login required
FAQ
What does the mock return?
Fake JSON responses shaped the way you describe, so your client code can fetch and render realistic data without a real backend.
Is this a replacement for a real API?
No. It's for development and testing. Once the real endpoint is ready, point your client at it and swap out the mock.
Can I shape the response structure?
Yes. You define the data structure so the mock matches what your real API will eventually return.
Can I use API Mock Generator on mobile?
Yes — ToolHub is fully responsive and works on iPhone, Android, tablets and all modern browsers. No app install needed.