auth-js

Auth.js v5 authentication setup involves installing the library, configuring environment variables for OAuth or credentials providers, and defining your session strategy—JWT or database-backed. Start with a simple protected route using middleware to enforce access control across your Next.js app.

Yes, Auth.js v5 supports edge-compatible configurations for Cloudflare Workers with D1 database adapters. Middleware patterns and JWT-based sessions enable route protection without cold-start penalties, though credential storage and token rotation require careful environment variable handling.

Role-based access control (RBAC) in Next.js integrates with Auth.js through middleware that inspects user roles from JWT tokens or database sessions. Attach roles during authentication, validate them in middleware, and gate routes or API endpoints based on permission requirements.

Migration from Auth.js v4 to v5 involves updating configuration structure, session adapters, and provider definitions. Auth.js v5 provides codemods and documented error prevention guidance to smooth the transition while maintaining JWT and database session strategies.

Auth.js v5 supports both Next.js routing patterns—App Router and Pages Router. Middleware-based route protection and session strategies function identically across both, letting you choose or migrate between them without authentication rework.

Auth.js v5 production support includes OAuth providers, credentials-based login, magic links, JWT sessions, and database-backed sessions. Multi-tenancy and token rotation are built-in, with environment variable configuration to manage provider credentials and secrets securely.