CORS Tester
Send HTTP requests and display all response headers
Request
Response appears here
Test HTTP Requests and Headers
The CORS Tester allows you to send custom HTTP requests directly from your browser to verify cross-origin resource sharing rules. You can input specific headers, including Bearer tokens, and include a request body when necessary. The tool provides immediate visibility into both response headers and the full response body. This functionality helps you confirm if a server correctly handles CORS policies or returns the expected data structures for your specific API requests.
Debugging API Integrations
Developers use this tool to troubleshoot issues where browser security policies block cross-origin requests. By manually constructing requests, you can identify whether missing headers or incorrect origins are causing failures. It is an ideal environment for testing authentication flows with Bearer tokens and verifying that your backend correctly serves data. Use it to isolate problems between your frontend implementation and the server configuration before writing any production code.
Frequently asked questions
What is a CORS tester?
A CORS tester is a tool used by developers to verify if an API allows requests from different origins. It simulates browser-based requests so you can see exactly which headers are returned and whether the server's CORS policy permits your specific request configuration.
Can I test Bearer tokens with this tool?
Yes, the tool includes a dedicated field for Authorization: Bearer tokens. This allows you to verify that your authentication credentials are correctly accepted by the server and that the response headers reflect the expected permissions without needing to write custom frontend code first.
How do I view the response body?
After sending a request, the tool displays both the response headers and the response body in separate sections. This allows you to see the raw data returned by the server, such as JSON or other formats, making it easier to debug your API integration.
Is my data safe when using this tool?
Because the tool is a browser-based utility, your request data and headers are processed directly in your browser. This means that sensitive information like API keys or Bearer tokens are not sent to an external server for processing by the platform.