CORS Tester
Test if a URL allows Cross-Origin requests from the browser.
About CORS Tester
Cross-Origin Resource Sharing (CORS) controls which domains can make requests to an API. This tool sends real requests from your browser to check CORS behavior.
How It Works
The tool makes an actual fetch request from this page. If the server allows cross-origin requests, you'll see the response and CORS headers. If CORS is blocked, the browser prevents access and you'll see the error.
Common CORS Headers
- Access-Control-Allow-Origin — Which origins can access the resource
- Access-Control-Allow-Methods — Allowed HTTP methods
- Access-Control-Allow-Headers — Allowed request headers
- Access-Control-Allow-Credentials — Whether cookies are allowed