Using MongoDB with Node.js

Introduction to MongoDB

MongoDB is a popular NoSQL database that allows you to store data in a flexible and scalable way. To use MongoDB with Node.js, you need to install the mongodb package. Run the following command in your terminal:

npm install mongodb

Step 1: Connect to MongoDB

Create a new file called app.js and add the following code to it:

const MongoClient = require('mongodb').MongoClient;
const url = 'mongodb://localhost:27017';
const dbName = 'mydatabase';

MongoClient.connect(url, function(err, client) {
  if (err) {
    console.log(err);
  } else {
    console.log('Connected to MongoDB');
    const db = client.db(dbName);
    // Perform database operations
    client.close);
  }
});

Step 2: Create a Collection

Create a new collection called users:

const collection = db.collection('users');

Step 3: Insert Documents

Insert a new document into the users collection:

collection.insertOne({ name: 'John Doe', age: 30 }, function(err, result) {
  if (err) {
    console.log(err);
  } else {
    console.log('Document inserted');
  }
});

Step 4: Find Documents

Find all documents in the users collection:

collection.find().toArray(function(err, results) {
  if (err) {
    console.log(err);
  } else {
    console.log(results);
  }
});

Step 5: Update Documents

Update a document in the users collection:

collection.updateOne({ name: 'John Doe' }, { $set: { age: 31 } }, function(err, result) {
  if (err) {
    console.log(err);
  } else {
    console.log('Document updated');
  }
});

Step 6: Delete Documents

Delete a document from the users collection:

collection.deleteOne({ name: 'John Doe' }, function(err, result) {
  if (err) {
    console.log(err);
  } else {
    console.log('Document deleted');
  }
});

You can now use MongoDB with Node.js to perform various database operations.