How do I add authentication to a Next.js app?

The text provides a comprehensive guide on implementing authentication in a Next.js application using JSON Web Tokens (JWTs). It begins by underscoring the importance of authentication in multi-user products and outlines common strategies such as session token authentication, JWT-based authentication, and OAuth. The guide then delves into setting up a Next.js application with JWT authentication, detailing steps to configure a SQLite database, create sign-up, sign-in, and sign-out functionalities, and protect routes with middleware. Furthermore, it discusses displaying user information on secure pages and highlights the limitations of a basic JWT implementation. The text concludes by introducing Clerk, a platform offering advanced authentication features like multi-factor authentication and social login, as a robust alternative for production-ready user management in Next.js applications.

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