🚀 Features

Everything You Need for API Testing

Comprehensive features designed for developers and QA engineers

⚡

Instant Responses

Get any status code from 100-599 instantly. No setup, no registration, no API keys required. Just use the endpoint.

🌍

CORS Enabled

Full CORS support allows you to test directly from your frontend. Works seamlessly with React, Vue, Angular, and more.

⏱️

Configurable Delays

Simulate slow APIs and test timeout handling. Add delays from 1ms to 60 seconds using the x-delay header.

🎨

Custom Headers

Mock authentication tokens, rate limits, and any custom headers. Perfect for testing header-based logic.

📦

Custom Payloads

Control the entire response body with JSON payloads. Test with realistic data structures for your use case.

🔒

All HTTP Methods

Supports GET, POST, PUT, DELETE, PATCH, HEAD, and OPTIONS. Test your full REST API workflow.

🚀

Cloudflare Powered

Running on Cloudflare's global edge network for ultra-fast responses from anywhere in the world.

💯

100% Free

No limits, no registration, no credit card required. Completely free forever for all developers.

💡 Use Cases

Perfect For Your Testing Needs

See how developers use MockerAPI in real-world scenarios

🔥

Error Handling

Test how your app handles 404s, 500s, and other error conditions gracefully with proper UI feedback.

⏳

Loading States

Simulate slow APIs to test loading spinners, skeleton screens, and timeout handling in your UI.

🎭

Frontend Mocking

Develop frontend features without waiting for backend APIs. Mock responses for rapid prototyping.

🔐

Auth Testing

Test authentication flows with 401 Unauthorized and 403 Forbidden responses. Verify proper redirects.

🚦

Rate Limiting

Simulate 429 Too Many Requests responses to test rate limiting UI and retry logic in your applications.

🧪

Integration Tests

Use in automated tests to verify API error handling without external dependencies or complex mocking.

📱

API Documentation

Create interactive API documentation with live examples showing different response scenarios.

🎓

Learning

Understand HTTP status codes by testing them interactively. Perfect for students and new developers.

📋 Status Codes

All HTTP Status Codes Supported

Click any status code to test it instantly and see detailed examples

🔍

2xx Success

10 codes

3xx Redirection

7 codes

4xx Client Errors

28 codes

5xx Server Errors

12 codes

500

Internal Server Error

Ready to Start Testing?

Just append any status code to the base URL. No signup required.

https://free.mockerapi.com/{status-code}

Try It Now →