Security Hardening
5 min read
Module Overview
What You’ll Learn
- Rate-limit login attempts to slow down brute-force attacks
- Manage secrets (JWT keys, database credentials) safely across environments
- Explain how this course’s authentication, validation, and existing middleware (Helmet, CORS) work together as defense in depth
💡 Why this matters: Authentication (Modules 2 and 3) and validation (Module 5) close some doors, but a login endpoint with no rate limit is still an open invitation to a brute-force attack. This module covers the hardening layer real production APIs need on top of correct auth alone.
What’s Covered
- Brute-force attacks, what one actually looks like against an unprotected login endpoint.
- Rate limiting, slowing down repeated requests with express-rate-limit.
- Secrets management, keeping JWT secrets and credentials out of source code, and rotating them safely.
- Defense in depth, how Helmet, CORS (Node.js & Express Foundations), validation, and rate limiting combine, no single layer is the whole story.
Hands-On
By the end of this module, you’ll have rate limiting on a login endpoint, demonstrated against a real, scripted brute-force attempt, blocked partway through.
Next module: automated testing, starting with unit tests for the logic built across this course so far.