Next.js Auth Handbook
Designs secure session management, OAuth callback flows, and server-side RBAC architectures for Next.js App Router applications.
The Next.js Auth Handbook skill provides architectural guidance and security best practices for implementing authentication and authorization in Next.js App Router projects. It helps developers establish robust session strategies—comparing opaque cookies, JWTs, and database sessions—while enforcing critical security patterns such as httpOnly flags, PKCE-verified OAuth/OIDC callbacks, and CSRF boundaries. By guiding permission checks directly into Server Actions, Route Handlers, and data access layers rather than relying on client-side gating or heavyweight Edge middleware, it ensures performant, production-ready authentication flows without vendor lock-in.