MongoDB connection with mongodb driver in Node.js - Mini Project: Build & Apply

MongoDB Connection with mongodb Driver in Node.js

📖 Scenario: You are building a simple Node.js application that needs to connect to a MongoDB database to store and retrieve data.Before you can work with the database, you must establish a connection using the official mongodb driver.

🎯 Goal: Learn how to connect a Node.js application to a MongoDB database using the mongodb driver.You will create a connection URI, configure the client, connect to the database, and close the connection properly.

📋 What You'll Learn

Create a MongoDB connection URI string

Import the MongoClient class from the mongodb package

Create a new MongoClient instance with the URI

Connect to the MongoDB server using the client

Close the connection after use

💡 Why This Matters

🌍 Real World

Connecting to MongoDB is essential for Node.js applications that need to store and retrieve data in a database.

💼 Career

Understanding how to connect to MongoDB using the official driver is a fundamental skill for backend developers working with Node.js and NoSQL databases.

1

Create the MongoDB connection URI

Create a constant variable called uri and set it to the exact string "mongodb://localhost:27017" which is the connection URI for a local MongoDB server.

Node.js

# Create a constant variable called uri with the connection string
# Your code here

Need a hint?

The connection URI is a string that tells the client where the MongoDB server is located.

2

Import MongoClient from mongodb package

Write a line to import MongoClient from the mongodb package using const { MongoClient } = require('mongodb');.

Node.js

const uri = "mongodb://localhost:27017";
// Import MongoClient from mongodb package
// Your code here

Need a hint?

This import statement allows you to use the MongoClient class to connect to MongoDB.

3

Create a MongoClient instance and connect

Create a constant called client and assign it a new MongoClient instance using the uri. Then write an async function called run that connects the client using await client.connect().

Node.js

const uri = "mongodb://localhost:27017";
const { MongoClient } = require('mongodb');
// Create client and async function to connect
// Your code here

Need a hint?

The MongoClient instance manages the connection. The connect() method opens the connection asynchronously.

4

Close the MongoDB connection properly

Inside the run function, after connecting, add a finally block that closes the client connection using await client.close(). Then call the run function.

Node.js

const uri = "mongodb://localhost:27017";
const { MongoClient } = require('mongodb');

const client = new MongoClient(uri);

async function run() {
    await client.connect();
    // Add finally block to close client
    // Your code here
}

// Call the run function
// Your code here

Need a hint?

Using finally ensures the connection closes even if an error occurs.