Connect Node with MongoDB

In this Article, I’ll walk you through the basics of how to get started using MongoDB with Node.js. In today’s post, we’ll work through connecting to a MongoDB database from a Node.js script, retrieving a list of databases, and printing the results to your console.

1. I have used Mongodb Compass. MongoDB Compass is?a powerful GUI for querying, aggregating, and analyzing your MongoDB data in a visual environment. Compass is free to use and source available, and can be run on macOS, Windows, and Linux. Now to create a collection, we need to create a database first

2. Click on Connect to connect to a MongoDB deployment.

3. Create a database and collection.

4. Insert data into the collection by using the following commancd

use databaseName;

db.collectionName.insertOne({name: 'xyz', age: 20, sex: 'male'})

5. In this way create 2-3 entries.

6. For example, I have created the following database.

7. Now go to VS code and connect Nodejs with MongoDB. To connect first install the npm package of mongodb:

npm i mongodb;

8. Then create mongodb.js file and type

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

const url = "mongodb://localhost:27017";

const Client = new MongoClient(url)

9. Now we will create dbConnect Funtion and connect our Client. It will return promise so we have to do this with async and await. The async keyword is used to define an asynchronous function, which returns a AsyncFunction object. The await keyword is used to pause async function execution until a Promise is fulfilled, that is resolved or rejected, and to resume execution of the async function after fulfillment.

async function dbConnect(){

let result = await Client.connect();

db = result.db(databaseName);

return db.collection(collectionName);

}

10. Now in index.js file we will create main function and find the data, convert it into array and print to console

const main = async() => {

let data = await dbConnect();

data = await data.find().toArray();

console.log(data);

}

Now as you can see we have the data which we entered in MongoDB compass is consoled in our VS code terminal.

Inserting Data from MongoDB

This is how we will insert the data by creating Array of Objects.

And we can see our data has been inserted.

Updating Records in MongoDB

1. We use updateOne() to update the records ,

2. Records have been updated.

Delete Records from MongoDB

So this is how we perform CRUD operation in MongoDB.