How do I know if an error is actually CORS?
Look at the browser console. A CORS error specifically mentions cross-origin or Access-Control headers. Other errors during a fetch, like network errors or 404s, are not CORS even though they happen during a request.
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More FAQs in How to Fix CORS Errors in a React App (Step by Step)
Use a proxy in development to bypass browser CORS, and route through your own backend in production. If you control the API, set the Access-Control-Allow-Origin header. Never disable CORS for users.
Only for quick local testing. It disables CORS in your browser, which works in development but is not a real solution and must never be used in production or asked of users.
Call the third-party API through your own backend, which can forward the request and add the correct headers. Never expose users to raw third-party CORS issues, and never ask users to disable CORS.
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