Auth

Auth.js (v5)

Unified authentication framework for JavaScript/TypeScript with first-class Next.js support.

Overview

Auth.js abstracts OAuth, SAML, and credential authentication into a single, type-safe configuration layer. It handles sessions, routing, and middleware natively while supporting any JavaScript backend or Edge runtime.

Best for

Next.js apps
rapid OAuth integration
edge-compatible projects

Trade-offs

vs Lucia Auth

Auth.js for turnkey OAuth and Next.js native routing; Lucia for database-first control and zero runtime overhead

What XeroHack pre-wires

When you pick Auth.js (v5) in the interview, the engine emits these files into your scaffold:

Next.js App Router
Remix
Express + ioredis

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