Authentication
Guides & Tutorials
Next.js 16 authentication tutorials covering Clerk and Auth.js (NextAuth) — sign-in flows, protected routes, session handling, and secure server actions.
8 guides
What Is Authentication? A Beginner's Guide (2026)
What is authentication? Learn how it works, the difference from authorization, common methods (sessions, JWT, OAuth/OIDC, passkeys), and how to implement it in Next.js.
Auth.js vs Better Auth in 2026: Which Should You Use?
Compare Auth.js vs Better Auth for Next.js in 2026 - setup, features, passkeys, organizations, and migration tips to help you pick the right auth library.
Session vs JWT: Which Should You Use in Next.js 16?
Session vs JWT in Next.js 16 compared: how each works, real code with jose, Server Actions, and proxy.ts, and how to pick the right one for your app.
Supabase Auth vs Firebase Auth in 2026
Supabase Auth vs Firebase Auth compared for 2026 — setup, pricing, Next.js App Router integration, security, and which one fits your project.
Role-Based Access Control (RBAC) in Next.js 16 (2026 Beginner's Guide)
Learn how to implement role-based authorization (RBAC) in Next.js 16 App Router with TypeScript, Auth.js v5, Proxy, Server Actions, Route Handlers, and permissions.
How to Add NextAuth (Auth.js v5) in Next.js 16
Add NextAuth (Auth.js v5) to Next.js 16 step by step — providers, sessions, protected routes, proxy.ts, and experimental passkey (WebAuthn) sign-in.
NextAuth (Auth.js) vs Clerk in 2026: Compared
Compare Clerk vs Auth.js (NextAuth) v5 in 2026 for Next.js 16. Setup time, pricing, middleware security, customization, and which one fits your project.
Add Clerk Authentication to Next.js 16 (2026)
Learn to implement Clerk in Next.js 16. Covers proxy.ts configuration, clerkMiddleware, auth.protect(), server actions, and protected routes.