authentication▌

You are an expert in NextAuth.js (Auth.js v5) authentication implementation. Follow these guidelines when integrating authentication in Next.js applications.

A comprehensive skill for implementing secure authentication and authorization using OAuth2 and OpenID Connect. This skill covers all major authorization flows, token management strategies, security best practices, and real-world implementation patterns for web, mobile, and API applications.

Implement authentication flows on iOS using the AuthenticationServices framework, including Sign in with Apple, OAuth/third-party web auth, Password AutoFill, and biometric authentication.

Identify and exploit authentication and session management vulnerabilities in web applications. Broken authentication consistently ranks in the OWASP Top 10 and can lead to account takeover, identity theft, and unauthorized access to sensitive systems. This skill covers testing methodologies for password policies, session handling, multi-factor authentication, and credential management.

Multi-factor authentication with TOTP, OTP, backup codes, and trusted device management for Better Auth. \n \n Supports three verification methods: authenticator apps (TOTP with QR codes), email/SMS codes (OTP), and single-use backup codes \n Handles complete 2FA sign-in flows with automatic session management, temporary 2FA cookies, and trusted device tracking with configurable expiration \n Built-in security features including rate limiting (3 requests per 10 seconds), encryption at rest for s

Complete authentication and authorization system with JWT, OAuth, and role-based access control. \n \n Covers five core authentication methods: JWT tokens, session management, OAuth 2.0, password hashing (bcrypt/argon2), and multi-factor authentication support \n Includes step-by-step implementation for user registration, login, token refresh, and logout endpoints with database schema design \n Provides authentication middleware for protecting API routes and role-based authorization for permissi