About

API Tester

Test HTTP APIs with a simple interface — supports all methods, custom headers, and request body

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Security Notice

This tool uses a server-side proxy. Do NOT use with production API keys or sensitive tokens.

Enter URL and click Send to test API

About This Tool

API Tester is a free online tool for testing HTTP APIs without dealing with browser CORS restrictions. It supports all common HTTP methods including GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS. You can customize request headers, add request bodies in JSON or other formats, and view detailed response information including status codes, headers, and response time. The tool uses a server-side proxy to bypass CORS limitations, allowing you to test APIs from any domain. Whether you're debugging your own API endpoints, testing third-party services, or learning about HTTP protocols, this tool provides a simple and effective interface for API testing.

How to Use

  1. Enter the target API URL in the address field. Make sure to include the full URL with protocol (http:// or https://).
  2. Select the HTTP method from the dropdown (GET, POST, PUT, PATCH, DELETE, HEAD, or OPTIONS).
  3. Click on the Headers tab to add custom headers. Use the preset buttons for common headers like Content-Type or Authorization, or add custom headers manually.
  4. For POST, PUT, or PATCH requests, switch to the Body tab and enter your request payload. You can format JSON using the Format JSON button.
  5. Click the Send button to execute the request. The response will show status code, response time, headers, and body content.

Frequently Asked Questions

The tool uses a server-side proxy approach. When you send a request, it goes to our Next.js API route first, which then forwards the request to the target API from the server. Since servers are not subject to browser CORS policies, this allows you to test APIs from any domain without encountering cross-origin errors.
Yes, the proxy server only forwards your request and returns the response. We don't log or store your request data, API keys, or responses. However, for production APIs containing sensitive data, we recommend using this tool for testing purposes only and not for accessing production secrets.
The tool supports all standard HTTP methods: GET (retrieve data), POST (create resources), PUT (update resources), PATCH (partial updates), DELETE (remove resources), HEAD (get headers only), and OPTIONS (check supported methods). Each method can be selected from the dropdown menu.
Yes, you can add authentication headers such as Authorization: Bearer <token> or custom API keys in the Headers section. Use the preset button for quick Authorization header setup, then add your token or key value.
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