next-auth

What is next-auth?

NextAuth.js is a complete open-source authentication solution for Next.js applications. It provides a simple and secure way to add authentication to your Next.js app, supporting various authentication providers, including OAuth, email/password, and custom credentials.

What are next-auth's main functionalities?

OAuth Authentication

NextAuth.js supports OAuth authentication with various providers like Google, Facebook, GitHub, etc. The code sample demonstrates how to configure Google and Facebook OAuth providers.

```javascript
import NextAuth from 'next-auth';
import Providers from 'next-auth/providers';

export default NextAuth({
  providers: [
    Providers.Google({
      clientId: process.env.GOOGLE_CLIENT_ID,
      clientSecret: process.env.GOOGLE_CLIENT_SECRET
    }),
    Providers.Facebook({
      clientId: process.env.FACEBOOK_CLIENT_ID,
      clientSecret: process.env.FACEBOOK_CLIENT_SECRET
    })
  ]
});
```

Email/Password Authentication

NextAuth.js allows email/password authentication by sending magic links to users' email addresses. The code sample shows how to configure the email provider.

```javascript
import NextAuth from 'next-auth';
import Providers from 'next-auth/providers';

export default NextAuth({
  providers: [
    Providers.Email({
      server: process.env.EMAIL_SERVER,
      from: process.env.EMAIL_FROM
    })
  ]
});
```

Custom Credentials Authentication

NextAuth.js supports custom credentials authentication, allowing you to define your own logic for authenticating users. The code sample demonstrates a simple username/password authentication.

```javascript
import NextAuth from 'next-auth';
import Providers from 'next-auth/providers';

export default NextAuth({
  providers: [
    Providers.Credentials({
      name: 'Credentials',
      credentials: {
        username: { label: 'Username', type: 'text' },
        password: { label: 'Password', type: 'password' }
      },
      authorize: async (credentials) => {
        const user = { id: 1, name: 'User' };
        if (credentials.username === 'user' && credentials.password === 'password') {
          return Promise.resolve(user);
        } else {
          return Promise.resolve(null);
        }
      }
    })
  ]
});
```

Session Management

NextAuth.js provides session management, allowing you to access the user's session data on both the client and server sides. The code sample shows how to retrieve the session in a Next.js page using getServerSideProps.

```javascript
import { getSession } from 'next-auth/client';

export async function getServerSideProps(context) {
  const session = await getSession(context);
  return {
    props: { session }
  };
}
```

Other packages similar to next-auth

passport

Passport is a popular authentication middleware for Node.js. It is highly flexible and supports a wide range of authentication strategies. Compared to NextAuth.js, Passport requires more manual setup and configuration, but it offers greater flexibility and can be used with any Node.js framework.

auth0

Auth0 is a cloud-based authentication service that provides a comprehensive solution for authentication and authorization. It supports various authentication methods and integrates well with many platforms. Compared to NextAuth.js, Auth0 is a third-party service that requires a subscription for advanced features, but it offers a more extensive set of features and easier integration with multiple platforms.

firebase-auth

Firebase Authentication is a part of Google's Firebase platform, providing backend services to authenticate users in your app. It supports email/password, phone number, and various social providers. Compared to NextAuth.js, Firebase Authentication is a managed service that integrates seamlessly with other Firebase services, but it may not offer the same level of customization as NextAuth.js.

README

NextAuth.js

https://next-auth.js.org

About NextAuth.js

This is a beta release of NextAuth.js v2, an open source authentication library for Next.js and Severless.

It allows you to easily add sign in support to an application, without any third party service dependancies.

You choose your authentication providers (Google, Facebook, Email, etc) and add your database details (MySQL, Postgres, MongoDB, etc) and NextAuth does the rest!

Features

• Built for Next.js and for Serverless (but works in any environment)
• Lightweight, doesn't depend on Express or PassportJS
• Supports oAuth 1.x, oAuth 2.x and email / passwordless authentication
• Out of the box support for signing in with Google, Facebook, Twitter, GitHub, Slack, Discord, Twitch and other providers
• Exteremly simple to use client, with useSession() hook and an universal session() method
• Doesn't require client side JavaScript
• Supports both SQL and document storage databases with the default database adapter (TypeORM)
• Secure / host only and http only signed cookies; session ID never exposed to client side JavaScript
• Cross Site Request Forgery proteciton (double submit cookie method with a signed, HTTP only, host only prefix)
• Full customizeable web pages and emails

Note: NextAuth.js is not associated with Vercel or Next.js.

Getting Started

NextAuth.js supports both SQL and Document databases out of the box.

For example code and the latest documentation, go to next-auth.js.org