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Free Mock API Endpoint
live in seconds, no setup.

Generate a mock API endpoint online in seconds — no signup, no install, no config. Simulate API responses with custom JSON, latency, and failure testing. The best fake API server for frontend developers. Free alternative to Beeceptor, Mockoon & Postman.

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GET /m/x4t9rn2k 
// Response — 200 OK · 142ms  (delay: 100–200ms range)
{
  "success": true,
  "data": {
    "id": 42,
    "name": "Wireless Headphones",
    "price": 149.99,
    "in_stock": true
  }
}
// Headers: X-MockServer-Id: x4t9rn2k · X-MockServer-Hits: 7
Quick Mocks — No account needed

Free mock API endpoint — live in under 10 seconds.

Paste your JSON, pick a status code, hit Generate — you get a real, callable mock API URL instantly. No sign-up, no dashboard. Share with teammates, use in Postman, or call it from your frontend right now.

Try it now How it works
mockserver.in/m/x4t9rn2k · expires in 72h 
$ curl mockserver.in/m/x4t9rn2k

{
  "status": "ok",
  "user": {
    "id": 1,
    "name": "Alice"
  }
}

HTTP/2 200 · X-MockServer-Hits: 3

Everything you need in a mock API server online

No YAML, no Docker, no config files. Create a mock REST API endpoint and hit it instantly from Postman, React, or cURL.

Dynamic Path Params

Use {id}, {slug}, or any placeholder in your path. MockServer matches and injects the real value into your response automatically.

Live Traffic Logs

See every request as it hits — method, headers, body, timestamp, IP. Polled automatically so you never miss a hit.

Latency Simulation

Set a fixed delay or a random range (e.g. 100–500 ms). MockServer picks a value each request — perfect for testing loading states and timeouts.

Shareable Mocks

Generate a public read-only share link for any mock. Send it to teammates or embed in documentation.

Custom Headers

Add any response header — Content-Type, CORS, Authorization, X-Custom-Header. Full control over every response.

Intermittent Failures

Set a fail rate (e.g. 30%) and a failure status code. MockServer randomly returns the error response — simulate flaky services without touching your backend.

Quick Mocks — No Signup

Get a live URL in seconds with no account. Paste JSON, pick a status, click Generate. Your endpoint is live for 72 hours and fully editable via a secret link.

AI Mock Generation

Describe the endpoint in plain English — "user profile response with address" — and let AI generate realistic, well-structured JSON for you instantly.

Secure by Default

Sign in via Google or GitHub — no passwords, no email setup. OAuth keeps your account safe from day one.

Free Developer Tools

JSON Formatter, Beautifier, Diff, Repair, Minify, Base64 & URL Encoder, JWT Decoder, JSON Validator — 9 free browser-based utilities. No account, no uploads, everything runs locally.

Create a mock API endpoint in 60 seconds

No setup. No config. No waiting. Simulate API responses from any browser — perfect for frontend testing without a backend.

1

Sign in with Google or GitHub — or skip this entirely

One click — we create your account and a unique API slug automatically. No email confirmation, no onboarding wizard. Or use Quick Mocks — no account at all.

2

Create a mock endpoint

Pick a method (GET, POST, PUT…), set a path like /products/{id}, paste your JSON response, choose a status code. Done.

3

Hit your endpoint

Your mock is instantly live at mockserver.in/api/{your-slug}/{path}. Call it from Postman, your frontend, or cURL.

4

Watch traffic in real time

The Traffic Logs page shows every inbound request with full headers, body, and timestamps — auto-refreshing so you stay in the loop.

Frequently Asked Questions

Everything you need to know about MockServer.

MockServer is a free online tool to create instant HTTP mock API endpoints. You define the path, method, response body, status code and headers — and you get a live URL you can hit immediately from Postman, cURL, or your frontend app.

No. Quick Mocks lets you generate a live mock URL in seconds — no signup, no email, no credit card. Quick mock URLs are active for 72 hours. For persistent mocks, unlimited endpoints, and traffic logs you can sign in with Google or GitHub.

Mockoon runs locally on your machine and requires installation. Postman mocks require a Postman account and are tied to collections. MockServer is fully cloud-hosted — your mock API URL is live instantly from any browser with zero setup.

Yes. Like Beeceptor, MockServer lets you create a mock API endpoint online with no install. MockServer adds latency simulation, intermittent failure testing, AI-generated JSON responses, and real-time traffic logs — features not available on Beeceptor's free tier.

Absolutely. MockServer is built for exactly this use case — create mock REST API endpoints that return the JSON your frontend expects, so you can build and test UI without waiting for a real backend. CORS headers are fully configurable.

Yes. You can set a fixed delay (e.g. 200ms) or a random range (e.g. 100–500ms) per endpoint. You can also configure an intermittent failure rate (e.g. 30%) so MockServer randomly returns an error status — perfect for testing retry logic and loading states.

MockServer is free forever for up to 20 saved mocks with 7-day traffic logs. The Pro plan removes all limits and ads, and extends log history to 30 days.

Yes — MockServer is purpose-built for this. Point your React, Vue, Angular, or Next.js app at your mock API endpoint instead of the real backend. CORS is fully configurable per endpoint, so there are no cross-origin issues. You get a stable fake API to develop against before your backend is ready.

MockServer supports GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS. You can create separate mock endpoints for each method on the same path.

Yes. mocky.io is limited to simple static responses. RequestBin is focused on request inspection, not mocking. MockServer combines both — you can inspect live traffic AND serve controlled mock responses, with latency simulation, failure rates, and dynamic path parameters on top.

Your first mock API endpoint is free.

Free forever for up to 20 mock endpoints. No credit card required.

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