Fix CORS errors instantly

Use the Corsfix CORS proxy to fix your CORS errors. Simply add the proxy URL (https://proxy.corsfix.com/?) before your target API, and your request will work instantly. The proxy adds the necessary Access-Control-Allow-Origin headers to the request, allowing it to pass through the browser's policies without you needing to modify any backend code.

CORS errors happen because of a browser security feature called the Same-Origin Policy. By default, browsers only allow scripts to request resources from the same origin: the same protocol (http/https), domain, and port number. When your frontend at https://myapp.com tries to fetch data from https://api.example.com, the browser blocks the request because the domains don't match. This protects users from malicious scripts stealing data from other sites they're logged into. The server must explicitly opt-in to cross-origin requests by sending CORS headers like Access-Control-Allow-Origin. Without these headers, browsers will block the response, even if the API returned valid data.

Check your browser's Developer Tools (Console tab) for red error messages containing "blocked by CORS policy." Look for these common error messages: Access to fetch at '...' from origin '...' has been blocked by CORS policy No 'Access-Control-Allow-Origin' header is present on the requested resource Response to preflight request doesn't pass access control check

There are three main methods: using a CORS proxy, modifying server headers, or using browser extensions. Production CORS Proxy: Fix it instantly for all your users with a single line of code change. Server Configuration: The "manual" way, which requires access to the backend code to add headers. Browser Extensions: Only works on your local machine; it does not fix the issue for your website visitors.

Use a CORS proxy in your frontend code if you don't control the API, such as when consuming a third-party API (like Google or a weather service) that doesn't support CORS. If you own the target API, you can add the appropriate CORS headers (like Access-Control-Allow-Origin) directly in your backend code instead.