#Backend

Stop fighting CORS. Understand preflight requests, credentials, wildcard mistakes. CORS isn't a bug—it's your API warning you about real security issues.

Most developers think session hijacking is an advanced attack. It's not. It usually starts with something very basic: your cookies. Learn the 3 flags and token refresh pattern that actually works.

Your Node.js server runs fine for days. Then memory climbs past 800MB, then 1.2GB, then the process restarts. That's not a capacity problem — that's a memory leak. Here's how to find it before it finds you.