Migrating from Auth.js to Better Auth — Full Guide for Next.js App Router

Most Next.js 15 projects still rely on Auth.js — but Better Auth offers a much smoother experience, fully compatible with the App Router and React 19.

In this guide, I show you how to:

✅ Install Better Auth
✅ Set up your config
✅ Use new client-side hooks
✅ Handle sessions securely on server actions

Full guide here 👉 Migrating from Auth.js to Better Auth in Next.js 15

If you're planning an authentication upgrade soon, this might save you hours.

Let's discuss in comments if you have questions or run into issues!