How to Add Authentication to Next.js in 5 Minutes

Authentication is the first thing every SaaS builder needs to implement — and it's often the most frustrating. Between OAuth providers, session management, and database adapters, it can take days to get right.

In this guide, I'll show you how to add authentication to your Next.js app in under 5 minutes.

Why Authentication Matters for SaaS

Every SaaS application needs a way to identify users. Whether you're building a project management tool, an analytics dashboard, or a content platform — authentication is the foundation.

Without it, you can't:

• Personalize the user experience
• Protect routes and API endpoints
• Track usage and enforce limits
• Process payments

The Stack: NextAuth.js + Prisma

The most popular authentication solution for Next.js is NextAuth.js (now called Auth.js). Here's why:

• 15+ OAuth providers out of the box (Google, GitHub, Discord, etc.)
• Magic link authentication via email
• Session management with JWT or database sessions
• TypeScript-first with full type safety
• Framework-agnostic (works with any database)

Step 1: Install Dependencies

npm install next-auth @auth/prisma-adapter @prisma/client
npm install -D prisma

Step 2: Configure NextAuth

Create app/api/auth/[...nextauth]/route.ts:

import NextAuth from "next-auth";
import GoogleProvider from "next-auth/providers/google";
import { PrismaAdapter } from "@auth/prisma-adapter";
import { prisma } from "@/lib/prisma";

export const authOptions = {
  adapter: PrismaAdapter(prisma),
  providers: [
    GoogleProvider({
      clientId: process.env.GOOGLE_CLIENT_ID!,
      clientSecret: process.env.GOOGLE_CLIENT_SECRET!,
    }),
  ],
  pages: {
    signIn: "/login",
  },
};

const handler = NextAuth(authOptions);
export { handler as GET, handler as POST };

Step 3: Protect Your Routes

Use middleware to protect routes that require authentication:

// middleware.ts
export { default } from "next-auth/middleware";

export const config = {
  matcher: ["/dashboard/:path*", "/api/protected/:path*"],
};

Step 4: Add Login UI

"use client";
import { signIn, signOut, useSession } from "next-auth/react";

export default function LoginButton() {
  const { data: session } = useSession();

  if (session) {
    return (
      <button onClick={() => signOut()}>
        Sign out ({session.user?.email})
      </button>
    );
  }

  return <button onClick={() => signIn("google")}>Sign in with Google</button>;
}

Step 5: Session Provider

Wrap your app with the SessionProvider:

// app/layout.tsx
import { SessionProvider } from "next-auth/react";

export default function RootLayout({ children }) {
  return (
    <SessionProvider>
      {children}
    </SessionProvider>
  );
}

The Faster Way: Use a Boilerplate

If you want auth (plus payments, emails, database, SEO, and 200+ other features) pre-configured and ready to go, check out BoilerForge — the $97 Next.js SaaS boilerplate that lets you go from zero to production in 5 minutes.

Everything in this tutorial (and much more) comes built-in:

• Google, GitHub, and email authentication
• Prisma + PostgreSQL database
• Stripe payments
• Transactional emails
• Admin dashboard

Conclusion

Authentication doesn't have to be painful. With NextAuth.js and Prisma, you can have a fully functional auth system in minutes. And if you want to skip the setup entirely, a good boilerplate can save you weeks of work.

Happy shipping! 🚀