How do I check for CORS issues?
Look at the browser console for a CORS error. If present, the API is not allowing your origin. Use a proxy in development or route through your backend in production to resolve it.
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More FAQs in Checklist: What to Do When an External API Breaks Your React App
Open the browser Network tab and reproduce the issue. The status code, headers, and response body of the failing request tell you most of what you need to diagnose the problem.
404 means a wrong or changed URL. 401 or 403 means an auth or permission issue. 429 means rate limiting. 5xx means a server error on their end. Each points you to a different fix.
The response shape may have changed. Log the full response and update your parsing to match the new shape. A 200 status does not guarantee the data structure is what your code expects.
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