Production-ready Auth.js v5 setup for Next.js and Cloudflare Workers.
Use when: setting up authentication, implementing OAuth/credentials/magic links,
configuring D1 or PostgreSQL adapters, debugging session issues, migrating from
v4 to v5, fixing edge compatibility, troubleshooting JWT/database sessions,
resolving AUTH_SECRET errors, fixing CallbackRouteError, or implementing RBAC.
Covers: Next.js App Router & Pages Router, Cloudflare Workers + D1, OAuth providers
(GitHub, Google, etc.), credentials auth, magic links, JWT vs database sessions,
middleware patterns, role-based access control, token refresh, edge runtime
compatibility, and common error prevention.
Keywords: Auth.js, NextAuth.js, authentication, OAuth, credentials, magic links,
D1 adapter, Cloudflare Workers, Next.js middleware, JWT session, database session,
refresh tokens, RBAC, edge compatibility, AUTH_SECRET, CallbackRouteError,
CredentialsSignin, JWEDecryptionFailed, session not updating, route protection