API Tester

About API Tester

Test any REST API directly from your browser — no installation required. Send GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS requests with custom headers, query parameters, request body (JSON, form, or raw text), and authentication (Bearer token or Basic Auth). Responses are displayed with syntax-highlighted JSON, status codes, timing, size, and response headers. Includes request history, curl export, and a server-side proxy that bypasses CORS restrictions.

How to Use API Tester

Quickly test REST API endpoints by sending HTTP requests with custom headers, bodies, and authentication directly from your browser.

1. 1

   Enter the target API endpoint URL

   Type or paste the full URL of the REST API endpoint you wish to test into the address bar.

2. 2

   Select the HTTP request method

   Choose the appropriate method from the dropdown menu, such as GET, POST, PUT, PATCH, or DELETE.

3. 3

   Configure headers and authentication

   Add custom HTTP headers or set up authentication using Bearer tokens or Basic Auth credentials if required.

4. 4

   Define the request body parameters

   Input your payload in JSON, form-data, or raw text format if you are sending a POST, PUT, or PATCH request.

5. 5

   Send the request and analyze results

   Click the send button to execute the request and view the syntax-highlighted JSON response, status codes, and timing data.

6. 6

   Export as curl or view history

   Use the export feature to generate a curl command or review your previous requests in the history log.

Estimated time: PT2M

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API Tester: Free Online REST Client & Postman Alternative

Test REST APIs instantly with API Tester. Send GET, POST, and more with custom headers, auth, and CORS bypass. No install needed—try this free HTTP client now.