API Tester
Test REST APIs directly from your browser—requests are saved automatically in your local storage.
Query Parameters
curl -X GET "https://jsonplaceholder.typicode.com/posts/1" \ -H "Content-Type: application/json"
fetch("https://jsonplaceholder.typicode.com/posts/1", {
method: "GET",
headers: {
"Content-Type": "application/json",
},
})The Ultimate Online API Tester
A powerful, free, and secure REST client in your browser. Debug APIs, inspect JSON responses, and generate code snippets instantly—no installation required.
All HTTP Methods
Full support for GET, POST, PUT, DELETE, PATCH, HEAD, and OPTIONS requests.
Real-time Testing
Execute requests instantly directly from your browser with zero latency.
Secure & Private
Your data never leaves your browser. Requests are sent directly to the API endpoint.
JSON Editor
Built-in JSON editor with syntax highlighting for composing complex request bodies.
Query Params
Intuitive key-value builder for managing long and complex URL query strings.
Smart Request History
Your requests are saved automatically in your local storage. Re-run or debug legacy APIs anytime, even after a browser restart.
Local Persistence
No database required. Your API configurations, auth tokens, and request bodies stay safe in your own browser storage.
Code Generation
One-click export to cURL and JavaScript (Fetch) to use in your applications.
Response Inspector
Beautifully formatted JSON responses with syntax highlighting and status indicators.
How to Test an API in 3 Steps
Enter Request Details
Enter your API endpoint URL and select the HTTP method (e.g., GET or POST).
Configure Headers & Body
Add necessary headers (like Authorization) and request body for POST/PUT methods.
Send & Inspect
Click Send and analyze the formatted JSON response, status code, and headers.
Frequently Asked Questions
Is this tool free?
Yes, this online API tester is 100% free to use for unlimited requests.
Why do I get a Network Error?
This is usually due to CORS (Cross-Origin Resource Sharing). The API you are trying to access must allow requests from this domain.
Can I test local APIs?
Yes! Since the tool runs in your browser, you can request `localhost` endpoints as long as your local server allows CORS.
Is my data secure?
Absolutely. We don't store or proxy your requests. Everything happens client-side in your own browser.
Common problems this tool solves
Debug CORS Errors in Browser
Troubleshoot 'Network Error' or CORS failures. Learn why your browser blocks API requests and how to fix server-side headers.
Generate cURL Commands from API Requests
Easily export your browser-based API tests to cURL. A fast way to share reproducible API requests with your team.
Test REST API Endpoints Online
Quickly verify your API endpoints without installing Postman. Full support for GET, POST, and authentication in your browser.