Example

Check out the example project

The easiest way to get started is to clone the example application and follow the instructions in the README.

You can find a live demo of the example project at next-auth-example.now.sh

Add to an existing project

The example code below shows how to add authentication to an existing Next.js project.

Add API route

To add NextAuth.js to a project create a file called [...nextauth].js in pages/api/auth.

pages/api/auth/[...nextauth].js
import NextAuth from 'next-auth'
import Providers from 'next-auth/providers'
const options = {
// Configure one or more authentication providers
providers: [
Providers.GitHub({
clientId: process.env.GITHUB_ID,
clientSecret: process.env.GITHUB_SECRET
}),
// ...add more providers here
],
// A database is optional, but required to persist accounts in a database
database: process.env.DATABASE_URL,
}
export default (req, res) => NextAuth(req, res, options)

All requests to /api/auth/* (signin, callback, signout, etc) will automatically be handed by NextAuth.js.

tip

See the options documentation for how to configure providers, databases and other options.

Add React Hook

The useSession() React Hook in the NextAuth.js client is the easiest way to check if someone is signed in.

pages/index.js
import React from 'react'
import { signIn, signOut, useSession } from 'next-auth/client'
export default function Page() {
const [ session, loading ] = useSession()
return <>
{!session && <>
Not signed in <br/>
<button onClick={signIn}>Sign in</button>
</>}
{session && <>
Signed in as {session.user.email} <br/>
<button onClick={signOut}>Sign out</button>
</>}
</>
}

That's all the code you need to add authentication with NextAuth.js to a project!

tip

You can use the useSession hook from anywhere in your application (e.g. in a header component).

Add to all pages

To allow session state to be shared between pages - which improves performance, reduces network traffic and avoids component state changes while rendering - you can use the NextAuth.js Provider in pages/_app.js.

pages/_app.js
import { Provider } from 'next-auth/client'
export default function App ({ Component, pageProps }) {
return (
<Provider session={pageProps.session}>
<Component {...pageProps} />
</Provider>
)
}
tip

Check out the client documentation to see how you can improve the user experience and page performance by using the NextAuth.js client.

Deploying

When deploying your site set the NEXTAUTH_URL environment variable to the canonical URL of the website.

NEXTAUTH_URL=https://example.com
tip

To set environment variables on Vercel, you can use the dashboard or the now env command.

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