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

Authentication for Next.js.

---

Check out the documentation at nextjs.authjs.dev.