Auth.js provides a flexible, secure authentication experience. It is an open-source library that integrates seamlessly with modern JavaScript Frameworks. It supports a variety of authentication methods including OAuth (e.g. Google, GitHub), Credentials, and WebAuthn. This allows developers to select the best approach for their application. Auth.js supports multiple frameworks such as Next.js (e.g., Google, GitHub), SvelteKit (e.g., Express), Qwik and SolidStart. This allows developers to implement authentication on different platforms. The library provides built-in support to popular databases such as Prisma, Drizzle ORM (Object Relational Mapper), Supabase (Supabase ORM), Firebase and TypeORM. This simplifies user data management. Signed cookies, CSRF validation, and encrypted JSON Web Tokens are all security features that ensure robust protection of user data. Auth.js has been designed to work efficiently in serverless environments. It also provides extensive documentation and examples.