CORS header checker

Put it to work

Interpret CORS headers against request conditions.

From input to output

Open CORS header checker and load the example.
Read the format notes, choose your options, and replace the example with your input. Start with test data instead of sensitive information.
Run the tool and inspect the result and status. If an error appears, correct the input format and run it again.
Copy the output or download a file. Generated and converted results are not saved automatically.

Interpret CORS headers against request conditions. Interprets pasted headers only. It does not test server reachability or guarantee browser request success.

Example input

Access-Control-Allow-Origin: https://example.com
Access-Control-Allow-Methods: GET, POST
Access-Control-Allow-Headers: Content-Type

Reading the result

originAllowed: true
credentialsAllowed: true
preflightMethodAllowed: true

Details that matter

Format and meaning

Interprets pasted headers only. It does not test server reachability or guarantee browser request success.

Supported scope and limits

Text 1 MB

Split inputs that exceed the limit. If a format or algorithm is unsupported, choose a tool that matches your requirements instead of silently changing the format.

What happens to your data?

Tools run in your browser. DNS lookup sends the queried domain to the named external provider. Ads may appear on home, guide, and workspace pages according to settings.

Open tool

Put it to work

From input to output