What is the best authentication option for a Next.js app?

For most Next.js apps, Supabase Auth is a strong choice.

Supabase Auth provides:

• Pre-built UI components that handle sign in, sign up, OAuth, and more.
• Email and password, magic links, phone sign-in, and more.
• Social sign-in with multiple OAuth providers.
• Multi-factor authentication with TOTP and phone.
• Server-side sessions for the App Router through the @supabase/ssr package.
• Third-party authentication providers if you already have a managed identity provider.

To get started, see the Quickstart or the Next.js and Supabase Starter Kit, which includes a live demo of the app in action.