intermediate#Node.js#MongoDB#NoSQL
Using MongoDB with Node.js
Learn how to use MongoDB with Node.js, and understand the basics of NoSQL databases.
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.