Auth.js Skills

Auth

Auth.js v5 setup for Next.js -- Google OAuth, Credentials provider, session management, and Edge Runtime support.

Overview

This skill provides a comprehensive reference for implementing authentication in Next.js applications using Auth.js v5 (next-auth@beta). It covers the full auth lifecycle: environment configuration, provider setup (Google OAuth and Credentials), session management with JWT or database strategies, middleware-based route protection, and client/server component integration.

When to Use

• Setting up authentication in a Next.js App Router project
• Configuring Google OAuth or email/password login
• Implementing protected routes with middleware
• Extending session types or adding role-based access control
• Migrating from Auth.js v4 to v5

Key Features

• Universal auth() export: Single function for authentication across server components, API routes, server actions, and middleware
• Multi-provider support: Google OAuth and Credentials provider with bcrypt password hashing and Zod validation
• Edge Runtime compatible: Full support for middleware-based auth checks at the edge
• Session strategies: JWT (default) and database-backed sessions with Prisma adapter
• Type-safe: Module augmentation patterns for extending Session and JWT types
• Complete examples: Sign-in pages, registration API, RBAC helpers, and custom callback configurations

Example Prompts

Set up Auth.js v5 with Google OAuth in my Next.js app.

Add email/password authentication with Prisma and bcrypt to my project.

Implement role-based access control using Auth.js middleware.

Source

• Skill folder: skills/authjs-skills/
• Standard: agentskills.io