How do you connect to a MongoDB database in Node.js?

To connect to a MongoDB database in Node.js, you can use the official MongoDB Node.js driver or popular libraries such as Mongoose. Here’s how to connect to a MongoDB database using the official MongoDB Node.js driver:

• Install the MongoDB Node.js driver using npm:

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npm install mongodb

• In your Node.js application, import the mongodb module and create a MongoClient instance:

javascript
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const { MongoClient } = require('mongodb');

// MongoDB connection URI
const uri = 'mongodb://localhost:27017/mydatabase';

// Create a new MongoClient
const client = new MongoClient(uri);

• Connect to the MongoDB database using the connect() method:

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async function connectToDatabase() {
 try {
 // Connect to the MongoDB server
 await client.connect();
 console.log('Connected to MongoDB');
 } catch (error) {
 console.error('Error connecting to MongoDB:', error);
 }
}

connectToDatabase();

Once connected, you can perform database operations such as inserting documents, querying data, updating documents, and deleting documents using the MongoDB Node.js driver’s APIs.

Alternatively, you can use libraries like Mongoose, an ODM (Object-Document Mapper) for MongoDB, which provides a higher-level abstraction and additional features for working with MongoDB databases in Node.js.