API Request Tester

Test REST API endpoints directly from your browser — send GET, POST, PUT, DELETE requests with headers, auth, and body.

About API Request Tester

The API Request Tester is a browser-based HTTP client similar to Postman or Insomnia — designed for testing REST API endpoints without installing any software. Send requests with any HTTP method, add custom headers, include a JSON or form body, configure Basic or Bearer authentication, and inspect the full response including status code, headers, and body.

This tool is invaluable for exploring new APIs, debugging API integrations, verifying API behavior during development, and demonstrating API calls in documentation. Requests are sent directly from your browser, which means CORS restrictions apply — the API endpoint must either be on the same origin or return appropriate Access-Control-Allow-Origin headers.

FAQ

Why do some requests fail with CORS errors?
CORS (Cross-Origin Resource Sharing) is a browser security feature that blocks requests to different origins unless the server explicitly allows them. Many private APIs restrict browser-based requests. Use the cURL Generator to get command-line equivalents that bypass CORS, or use a proxy/backend to forward requests.
Can I test APIs that require authentication?
Yes. Use the Auth tab to add Bearer tokens, Basic Auth credentials, or API keys. The credentials are included in the request headers. Never use real production credentials for public APIs in a shared browser environment.

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