CORS Headers Generator (Access-Control-Allow-*)
Generate CORS headers (Access-Control-Allow-*) for your server.
🔒 100% client-side — no data sent
Build your CORS headers (Access-Control-Allow-Origin, Methods, Headers…) effortlessly and fix cross-origin policy errors. Copy a ready-to-use config for Nginx, Apache or your server code. Generated locally in the browser, no data sent.
What is it for?
- ▸ Fix a "blocked by CORS policy" error
- ▸ Allow specific origins and methods for your API
- ▸ Configure preflight (OPTIONS) requests and credentials
- ▸ Generate CORS config for Nginx, Apache or Express
FAQ
What are CORS headers for?
They tell the browser which external origins are allowed to access your resource, preventing cross-origin blocks.
Can I allow all origins with a wildcard?
Yes with *, but it's incompatible with sending credentials (cookies); specify an explicit origin then.
What is a preflight request?
An OPTIONS request the browser sends before certain requests to check the server allows the method and headers.