Next.js App Router Authentication (Sessions, Cookies, JWTs)

Why watch

A comprehensive guide to implementing authentication in Next.js App Router using sessions, cookies, and JWTs. Covers the foundational concepts of session-based auth, how cookies store and transmit credentials securely, and demonstrates how Auth.js (formerly NextAuth) builds on these patterns. Ideal for developers building secure Next.js applications who want to understand the underlying auth mechanisms.