Auth.js Setup

Auth.js (the new name of NextAuth, version 5) is the most used auth library for Next.js. It handles sign-in pages, OAuth providers (Google, GitHub), sessions, CSRF protection and secure cookies. Alternatives: Clerk, Better Auth, Supabase Auth, or your own JWT backend (see the NestJS material).

npm install next-auth@beta
npx auth secret

added 4 packages in 3s
📝 Created /home/ravi/shopease/.env.local with `AUTH_SECRET`.

auth.ts at the project root exports everything you need:

import NextAuth from 'next-auth';
import Google from 'next-auth/providers/google';

export const { handlers, auth, signIn, signOut } = NextAuth({
  providers: [Google], // reads AUTH_GOOGLE_ID and AUTH_GOOGLE_SECRET from env
  pages: { signIn: '/login' },
});

app/api/auth/[...nextauth]/route.ts — one catch-all route handles all auth endpoints:

import { handlers } from '@/auth';

export const { GET, POST } = handlers;