Install MongoDB

Node.js applications can interact with MongoDB databases using the official MongoDB driver for Node.js. Let's see how you can install MongoDB and the MongoDB driver for Node.js.

Install MongoDB Locally

1. Download MongoDB: Visit https://www.mongodb.com and download the MongoDB Community Server appropriate for your operating system.

2. Install MongoDB: Follow the installation instructions provided for your operating system on the MongoDB website.

MongoDB Cloud Service (Optional)

If you prefer using a cloud service for MongoDB, you can sign up for MongoDB Atlas:

1. Sign Up for MongoDB Atlas: Visit https://www.mongodb.com/cloud/atlas and sign up for a MongoDB Atlas account.

2. Create a Cluster: After signing up, create a new cluster by following the instructions provided in the MongoDB Atlas dashboard.

Install MongoDB Driver for Node.js

1. Open Command Terminal: Open your command terminal or command prompt.

2. Install the MongoDB Driver: Run the following command to install the official MongoDB driver for Node.js:

   npm install mongodb
   

Example Usage

Once you've installed the MongoDB driver, you can start using it in your Node.js application. Here's an example of how you can connect to a MongoDB database, insert documents into a collection, and find documents in a collection.

Create a new file named app.js and add the following code:

// Import the MongoDB module
const { MongoClient } = require('mongodb');

// Connection URI
const uri = 'mongodb://localhost:27017';

// Database Name
const dbName = 'mydatabase';

// Create a new MongoClient
const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true });

// Connect to the MongoDB server
client.connect(async err => {
  if (err) {
    console.error('Error connecting to MongoDB:', err);
    return;
  }

  console.log('Connected to MongoDB');

  // Access a database
  const db = client.db(dbName);

  // Perform operations
  await insertDocuments(db, [
    { name: 'John', age: 30 },
    { name: 'Alice', age: 25 },
    { name: 'Bob', age: 35 }
  ]);

  await findDocuments(db);
  
  // Close the connection
  client.close();
});

// Function to insert documents into a collection
async function insertDocuments(db, documents) {
  const collection = db.collection('users');
  const result = await collection.insertMany(documents);
  console.log(`${result.insertedCount} documents inserted`);
}

// Function to find documents in a collection
async function findDocuments(db) {
  const collection = db.collection('users');
  const cursor = collection.find();
  await cursor.forEach(doc => console.log(doc));
}

Replace 'mongodb://localhost:27017' with your MongoDB connection string if you're using MongoDB Atlas or a different host. Also, ensure that you replace 'mydatabase' with the name of your MongoDB database.

Run the application using the following command:

node app.js

The application will connect to the MongoDB database, insert the specified documents into a collection, and then find and log the documents in the collection.

That's it! You've successfully installed MongoDB and the MongoDB driver for Node.js. You can now start building Node.js applications that interact with MongoDB databases.