What if I control the API that is causing the CORS error?
Configure the API to return the Access-Control-Allow-Origin header with your allowed origins. This is the real server-side fix and is the correct approach when the API is yours to control.
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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.
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.
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.
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