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CORS Checker — Test If An API Works In The Browser

The question this answers is the one that decides your architecture: can I call this endpoint from front-end JavaScript, or do I need a backend in the way?

Endpoint

What this does

  • Runs a real cross-origin request from your browser
  • Tells CORS rejection apart from the endpoint simply being down
  • Reports status, timing and the headers the browser will let it read
  • Nothing is uploaded — the request goes straight from you to the endpoint

Looking for an API to try it against? Browse APIs that need no key — you can call those straight from this page.

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