Login y Registro con JWT y NextAuthjs

Next.js is a popular JavaScript framework for building modern web applications. MongoDB is a leading NoSQL database. NextAuth.js is a complete open source authentication system for Next.js applications. In this article, we will explore how to implement authentication with MongoDB and NextAuth.js in a Next.js application.

Setting up MongoDB

The first step is to set up a MongoDB database. You can either use a self-hosted MongoDB instance or a cloud-based MongoDB service like MongoDB Atlas. Once you have your MongoDB database ready, you can proceed to the next step.

Creating a Next.js Application

Next, you need to create a Next.js application. You can do this using the following command:

npx create-next-app my-nextjs-auth-app

This will create a new Next.js application in a directory called my-nextjs-auth-app. Navigate into this directory and install the required dependencies:

cd my-nextjs-auth-app
npm install next-auth mongodb

Implementing Authentication with NextAuth.js

Next, you need to configure NextAuth.js to work with MongoDB. First, create a new file called […nextauth].js in the pages/api/auth directory. In this file, you can configure NextAuth.js to use MongoDB as its database and JWT for authentication:

// pages/api/auth/[...nextauth].js

import NextAuth from 'next-auth'
import Providers from 'next-auth/providers'
import { connectToDatabase } from '../../../util/mongodb'

export default NextAuth({
providers: [
Providers.Credentials({
async authorize(credentials) {
const { db } = await connectToDatabase()
const user = await db
.collection('users')
.findOne({ email: credentials.email })
if (user && user.password === credentials.password) {
return user
} else {
return null
}
}
})
],
database: process.env.MONGODB_URI,
})

This code sets up a custom credentials provider to handle login using email and password. It also configures NextAuth.js to use MongoDB as the database. Make sure to define the MONGODB_URI environment variable in your .env.local file.

Implementing Login and Registration Forms

Now that authentication is set up, you can implement login and registration forms in your Next.js application. You can use the NextAuth.js useSession and getSession hooks to check if a user is authenticated and get their session information:

// pages/index.js

import { useSession, getSession } from 'next-auth/react'

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

if (session) {
return

} else {
return (

)
}
}

With these forms, users can log in using their email and password and register for a new account.

Conclusion

In this article, we learned how to implement authentication with MongoDB and NextAuth.js in a Next.js application. By using these technologies, you can easily add secure user authentication to your web application with minimal effort.