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Send HTTP requests to any API directly from your browser. Test GET, POST, PUT, DELETE with headers, body, and authentication. No installation needed.
You need to quickly test an API endpoint — check if it returns the right data, debug a 401 error, or verify a POST body format. Installing Postman or Insomnia takes time and disk space. Curl commands are powerful but hard to read, especially with complex headers and JSON bodies. You just want a simple interface to fire off a request and see the response.
Our API Tester lets you send HTTP requests from your browser with a clean visual interface. Enter the URL, method, headers, and body, then send and inspect the response — status code, headers, and body with syntax highlighting. Save frequently used requests for later. No sign-up, no installation.
Open API TesterNavigate to the API Tester tool on OnlineTools4Free.
Type the API URL, select the HTTP method (GET, POST, PUT, PATCH, DELETE), and add any required headers (Content-Type, Authorization, custom headers).
Enter your JSON, form data, or raw body. The editor provides syntax highlighting and validates JSON before sending.
Click Send. View the response status code, response time, headers, and body. JSON responses are automatically formatted and syntax-highlighted.
Modify your request and send again. Use the response details to debug issues — check status codes, error messages, and response headers.
No signup, no upload, 100% private. Works right in your browser.
Open API TesterFormat, validate, and beautify JSON data with syntax highlighting.
Decode and inspect JSON Web Tokens to view header, payload, and signature.
Encode and decode URLs instantly. Handle special characters, unicode, query strings. Free online tool.