Dev Tutorial Breaks Down JWT Auth, Rate Limiting, and Timing Attack Defenses

A software developer has published an interactive educational resource explaining how to build a secure authentication backend from the ground up. The project covers six core topics including JWT access tokens, refresh tokens, rate limiting, and protection against timing-based information leaks. The demo illustrates how middleware ordering affects security, noting that the rate limiter intentionally runs before authentication to also protect public routes like login endpoints. It also highlights a known limitation: refresh tokens do not rotate on use, meaning a leaked token cannot be automatically detected. The resource is available as both a live demo and an open-source repository on GitHub.