ECOMMERCE Website Using MERN Part-2 ( Database Setup )

Database Setup

In this blog we will be setting up our Database(MongoDb) using mongoose.

Step-1 We will be running the database server locally for the development phase, for that we need to download MongoDB Compass so that we can see the contents of the database

Step-2 After downloading MongoDb Compass just install it on our machine it's way simple :)

After installation open it and it should look like this

The base has been set, now lets go for the codes

Step-3 On the config.env file we make another variable

MONGO_URI=mongodb://localhost:27017/ECommerce

Here the ECommerce is our database name, you can write anything in place of that but mind the naming conventions

After this your env file should have these contents

Step-4 Now lets make another file on the config folder named database.js. Here we will write the necessary code for connecting to the database.

Your folder structure shall look like this

Step-5 In the database.js file we will write the following codes

 const mongoose = require("mongoose");

 const connectDatabase = () => {
  mongoose
    .connect(process.env.MONGO_URI)
    .then((data) => {
      console.log(`Mongodb connected with server ${data.connection.host}`);
    })
    .catch((err) => {
      console.log(err);
    });
};

module.exports = connectDatabase;

Here we are first importing mongoose which we have already installed on our project in Part-1.

Then we made a function where we are connecting to the MongoDb database using mongoose.connect() function which takes a The MONGO_URI which we already made in our config.env file.

After that we passed two callback functions .then() & .catch() which will be called when there is a success _or an _error connecting while connecting to the Database respectively.

After that we exported the function so that we can use it on our server.js file

Step-6 Now in the server.js file we import the connectDatabase() from the database.js file by writing the following line

const connectDatabase = require("./config/database");

Step-7 After the calling of dotenv.config() and before the app.listen() we call the function connectDatabase(). By this the function will also get access to the environment variables .

Your server.js file shall look like this

Step-8 Now we can test your server again by writing npm run dev on the terminal. As we wrote an console.log() statement we shall see an statement Mongodb connected with server localhost