Connect nodejs with mongodb

 

 

 

Mongodb basic command

This blog and in upcoming blog we will see mongodb basic and how is it work with installation and after installation we should not face any problem while making Database, collection(table) and using the data in nodejs even whenever we will make API.

• # Install MongoDB Package
  
• # Connect MongoDB with Nodejs
  
• # Show data from mongoDB

 

Now in this blog we will consider about mongoDB basic command which we can use to create Database, collection etc.

 

 What is MongoDB

 

MongoDB is a popular open-source NoSQL (non-relational) database management system. NoSQL means no structure like it is look like an object while in SQL it is a structure query language like SELECT CustomerName, City FROM Customers; (The SELECT statement is used to select data from a database.) But NoSQL database is useless...NOT completely because of whenever we want add extra column in database then it is possible through NoSQL MongoDB.   

 

MongoDB installation - CLICK HERE

MongoDB Basic Command - CLICK HERE

About MongoDB vs SQL - CLICK HERE

CRUD in MongoDB - CLICK HERE

 

 

Object Like - 

 

 

{
  "_id": {
    "$oid": "659ad46e0382148123c82841"
  },
  "name": "moto G60",
  "brand": "motorola",
  "price": 16500,
  "category": "mobile"
}

 

 

MongoDB is a type of database that helps store and manage large amounts of data in a flexible and scalable way. Unlike SQL, MongoDB doesn't require a fixed structure for the data, allowing you to store information in a more versatile format.

• MongoDB is a NoSQL database.
• The data stored in a collection
• Collection don't have row and columns
• Data is stored in the form of object.

Now you can understand how can we connect nodejs with the mongodb and how can we use nodejs with the help of mongodb and data insert, update, delete, update dynamic data or make API . 

 and we have some data in mongodb so after connecting mongodb with the nodejs we can show data from mongodb in nodejs.

we can install this driver as a pkg but it is driver YEAH! because of we can connect nodejs and mongodb with the help of this driver pkg OKAY.

The official MongoDB driver for Node.js. - https://www.npmjs.com/package/mongodb ( npm i mongodb )

 

 

 

 

 

Connect MongoDB with Nodejs

 

 Now we will write code in index.js for importing mongodb client and some code.

1. Importing MongoDB and Setting Up Connection:


const { MongoClient } = require('mongodb');
const url = 'mongodb://127.0.0.1:27017';


Here, you are importing the MongoClient class from the 'mongodb' package, which is the official MongoDB driver for Node.js. You define the connection URL for your MongoDB server. In this case, it's mongodb://127.0.0.1:27017, which is the default address and port for a locally running MongoDB server.



2. Defining Database and Creating a MongoClient:


const database = 'e-comm';
const client = new MongoClient(url);



You specify the name of the database you want to connect to (e-comm), and then you create a new instance of the MongoClient using the provided connection URL.





3. Asynchronous Function to Retrieve Data:



async function getData() {
  let result = await client.connect();
  let db = result.db(database);
  let collection = db.collection('products');
  let response = await collection.find({}).toArray();
  console.log(response);
}



# This function, getData, is marked as async, indicating that it contains asynchronous operations.

# await client.connect();: It connects to the MongoDB server asynchronously and returns a result. This result is an instance of the MongoClient connected to the MongoDB server.

# let db = result.db(database);: It retrieves the specified database (e-comm in this case) from the connected MongoClient.

# let collection = db.collection('products');: It gets a reference to the 'products' collection within the 'e-comm' database.

# let response = await collection.find({}).toArray();: It performs a query to find all documents in the 'products' collection and converts the result to an array.

# console.log(response);: Finally, it logs the array of documents (or an empty array if there are no documents) to the console.



4. Calling the getData Function:


getData();



The script concludes by calling the getData function. When executed, it will connect to the MongoDB server, retrieve data from the 'products' collection, and log the result to the console.

Whole Code 

 

const {MongoClient} = require('mongodb');
const url = 'mongodb://127.0.0.1:27017'

const database = 'e-comm'
const client = new MongoClient(url);

async function getData()
{
  let result = await client.connect();
  let db = result.db(database);
  let collection = db.collection('products');
  let response = await collection.find({}).toArray();
  console.log(response);
}

getData();

 

 

Run through this command - nodemon index.js or node index.js

 

 

 

 

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