Using Mongoose to connect NodeJS and MongoDB

Node.js is an open-source, cross-platform JavaScript runtime environment and library for running web applications outside the client's browser.

MongoDB is a document database used to build highly available and scalable internet applications. It is a non-relational database that provides support for JSON-like storage.

Mongoose is a Node.js based Object Data Modelling (ODM) library for MongoDB. It manages relationships between data and provides Schema validation.

A typical MongoDB document looks like this -

Why is MongoDB used with Node.js?

The MongoDB + Node.js driver makes using MongoDB with Node.js a seamless and smooth experience. The driver automatically maps JavaScript objects to BSON documents, meaning that the developers can easily work with their data.

Thus, if we want to have MongoDB as the database of our Application in which we are using Node.js, it is advisable to use Mongoose, as Mongoose basically establishes a connection between Node.js and MongoDB.

Steps to Connect Node.js and MongoDB using Mongoose

Step 1 : Firstly, you need to create an account on the official MongoDB website. You can visit it here - https://www.mongodb.com/

You can either sign up using your Gmail account or your Github account.

Step 2 : After creating an account, now you have to create a new Project.

Click on New Project

Give a suitable name to your project.

Step 3 : Now, after creating a Project, you have to create a new Database.

Create on Build Database.

Choose your required options, then click on Create.

Now, store your username and password in a safe location, as it will be required later.

Now, set up the I.P. Address for your project. Click on Add My Current IP Address

Finally, click on Finish and Close.

You have successfully created a new Project and a new Database.

Step 4 : Now, you have to connect your Node.js project to MongoDB Atlas using Mongoose.

Click on Connect

Choose the Drivers option.

Copy and store your MongoDB URI, as you will need it later.
Click on Close.

Now, install Mongoose in your project with the following command -

npm install mongoose

Create a file named conn.js, write the following code in it -

const mongoose = require("mongoose");

const DB = mongodb+srv://username:<password>@cluster0.j3sj2kd.mongodb.net/?retryWrites=true&w=majority;

mongoose.set("strictQuery" , true);

mongoose.connect(DB, {
    useNewUrlParser : true,
    useUnifiedTopology : true
}).then(()=>{
    console.log("Database Connected");
}).catch((err)=> console.log(err));

Replace the password with your Database Password in your MongoDB URI.

Now, we also want to create a Server, for which we will install the ExpressJS module. We can install it with the following command -

npm install express

Create another file index.js, write the following code in it -

const express = require("express");

require("./conn");

const app = express();

app.listen(8080, () => {
    console.log(`Server started at Port 8080`);
});

To run the file, type the following command in your terminal -

node index.js

You will see the following output -

Database Connected
Server started at Port 8080

And thats it! You have successfully learnt how to connect NodeJS with MongoDB by using Mongoose!

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