What are some common tools or techniques for debugging CORS errors?

Common tools and techniques for debugging CORS errors include: 1. Browser Developer Tools (Console tab) to see the specific error message. 2. Network tab in browser developer tools to inspect the request and response headers for both the preflight (OPTIONS) and the actual request. 3. Online CORS testing tools or browser extensions that can help diagnose misconfigurations. 4. Examining server logs to see if the request is even reaching the server and what headers are being sent back.