A single vulnerability can compromise your entire system. Defense in depth is the only way forward.
1Configuring CORS
Don't just use app.use(cors()). Be specific. Define an allow-list of trusted domains to ensure that only your frontend can interact with your sensitive backend endpoints.
2HTTP Header Protection
Attackers look for 'X-Powered-By: Express' to know what vulnerabilities to target. Helmet hides these headers and adds others that prevent Clickjacking and MIME-type sniffing.
3Rate Limiting Logic
Implementing express-rate-limit is your first line of defense against botnets and script kiddies. By limiting each IP to 100 requests per 15 minutes, you ensure fair resource distribution.
