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CORS Tester

Test CORS (Cross-Origin Resource Sharing) policies for any API endpoint.

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About CORS

Cross-Origin Resource Sharing (CORS) is a security mechanism that allows or restricts web applications from making requests to a different domain than the one serving the web page.

For a request to succeed cross-origin, the server must include appropriate Access-Control-Allow-* headers in its response.

What is CORS Tester?

CORS Tester checks Cross-Origin Resource Sharing policies for any API endpoint. It helps diagnose CORS issues by showing which origins, methods, and headers are allowed by the server.

Common Use Cases

API Development

Verify CORS is configured correctly on your APIs.

Debugging

Diagnose "CORS blocked" errors in browser console.

Integration

Check if third-party APIs allow your origin.

Security Review

Audit CORS policies for overly permissive settings.

How to Use This Tool

  1. Enter the API endpoint URL
  2. Select the HTTP method to test
  3. Enter your origin (or use default)
  4. View CORS headers in the response

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CORS Tester is a free online tool that requires no signup or installation. It works directly in your browser, keeping your data private and secure.