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NextAuth is a popular authentication library for React applications that provides a simple and secure way to handle user authentication, authorization, and session management. It supports a variety of authentication providers, including MongoDB. Prerequisites Before configuring NextAuth for MongoDB, you will need to: Install MongoDB and create a database and collection for storing user data. Install the mongodb Node.js driver. Configuration To configure NextAuth for MongoDB, follow these steps: Install the next-auth and mongodb packages: npm install next-auth mongodb Create a new file called [...nextauth].js in your project's root directory. This file will contain your NextAuth configuration. Import the NextAuth and MongoDBAdapter classes from the next-auth and mongodb packages, respectively: import NextAuth from "next-auth"; import MongoDBAdapter from "next-auth/adapters/mongodb"; Configure NextAuth using the MongoDBAdapter: export default NextAuth({   a...