Fix · Express / Node

Fix “CORS policy” on Express / Node

Never echo back the request Origin. Allow only a fixed list of your own origins, and only send credentials to those.

app.use(cors({ origin: ['https://yourapp.com'], credentials: true }));  // never origin: true + credentials

Verify the fix

Re-run the CORS policy check after deploying. Test config changes in staging first and keep a rollback: a wrong header can break a site faster than a missing one.

Other stacks: nginx · Apache · Caddy · Cloudflare

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