Session tokens that just expire and boot users out make for a rough experience. This lesson tackles that by adding JWT-based authentication to a NestJS backend, complete with refresh tokens so people stay signed in without re-entering credentials.
What You'll Build
You'll wire a NestJS API to a Next.js front end, generating access and refresh tokens, storing and validating them on the server, and gating routes with Passport.js guards. A Google OAuth option is layered in for one-click sign-in alongside the standard flow.
Core Techniques
- Issuing and verifying JWT access and refresh tokens
- Persisting and checking refresh tokens server-side
- Guarding routes with custom middleware and Passport.js
- Adding Google OAuth as a login option
- Connecting the auth system to a Next.js client
Why It Matters
Authentication mistakes are expensive to fix later. Working through this build gives you a repeatable pattern for token handling and route protection that carries over to any full-stack NestJS project.