API Mock Server
FreeCreate a live mock API server with custom responses
About API Mock Server
Frontend work often gets blocked waiting on a backend that isn't ready, and hardcoding fake data into your components is a mess to clean up later. The API Mock Server lets you stand up a live mock endpoint with the custom responses you define, so your code can make real requests and get predictable data back while the actual API is still being built.
Define the responses you want the mock to return and the tool exposes a live endpoint that serves them. Your app talks to it just like a real API, which lets you develop and test against realistic data without depending on the production backend. It's free, runs in the browser, and needs no signup, making it a practical way to unblock development, demo features, or reproduce specific response scenarios on demand.
Common uses
- Build a frontend feature against a mock endpoint while the real backend is still in progress.
- Return a specific error or edge-case payload to test how your UI handles unusual responses.
- Demo an app with stable, predictable data instead of relying on a flaky staging API.
- Reproduce a hard-to-trigger response shape so you can debug your client-side parsing.
- Prototype an integration's request flow before the actual service contract is finalised.
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?
- Test APIs instantly
- No Postman needed
- Full header control
FAQ
Can I customise what the mock returns?
Yes. You define the responses the endpoint serves, so you control the data and status your app receives.
Is the mock endpoint actually reachable?
It exposes a live endpoint your application can send real requests to, returning the responses you configured.
Is this meant for production use?
It's built for development, testing, and demos rather than serving production traffic. Replace it with the real API when that's ready.
Do I need an account to create a mock?
No. You can define responses and use the mock without signing up.
Can I use API Mock Server on mobile?
Yes — ToolHub is fully responsive and works on iPhone, Android, tablets and all modern browsers. No app install needed.