Module 7 of 11

Security

Think like an attacker and defend like an engineer: web vulnerabilities, API hardening, advanced auth, and protecting stored data.

4 lessons

~13 hours

135 XP

The threat landscape every developer must know: XSS, CSRF, injection, clickjacking, and the headers, cookies, and policies that stop them.

Lock the API down: security headers with Helmet, rate limiting, input validation at the edge, secret handling, and dependency hygiene.

Beyond basic JWT: refresh token rotation, session invalidation, 2FA with TOTP, OAuth 2.0 flows, and role-based access control.

Guard the data layer: NoSQL operator injection, least-privilege database users, encryption, backups, and handling personal data responsibly.