How to Create a Server-Side Web App using Node JS & Express JS | How To Connect to MongoDB | Part 5
Creating a server-side web app using Node JS and Express JS is a powerful way to build scalable and efficient web applications. In this tutorial, we will learn how to connect to a MongoDB database using a Node JS application. This is part 5 of our series on building a server-side web app.
Step 1: Set Up the Project
First, create a new directory for your project and navigate to it using the terminal. Then, run the following command to initialize a new Node JS project:
npm init -y
This will create a package.json file with default values. Next, install the necessary dependencies using the following commands:
npm install express mongoose body-parser
Express is a minimal and flexible Node JS web application framework that provides a robust set of features for web and mobile applications. Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment, while body-parser is a middleware for parsing incoming request bodies in a Node JS application.
Step 2: Connect to MongoDB
Create a new file called app.js and add the following code to it:
const express = require('express');
const mongoose = require('mongoose');
const bodyParser = require('body-parser');
const app = express();
app.use(bodyParser.json());
// Connect to MongoDB
mongoose.connect('mongodb://localhost:27017/myapp', { useNewUrlParser: true, useUnifiedTopology: true })
.then(() => console.log('Connected to MongoDB'))
.catch(err => console.error('Could not connect to MongoDB', err));
app.listen(3000, () => {
console.log('Server is running on port 3000');
});
This code sets up a basic Express JS server and connects to a local MongoDB database called myapp. You can customize the database URL according to your requirements.
Step 3: Test the Connection
To test the connection to MongoDB, run the following command in the terminal:
node app.js
If the connection is successful, you should see the message ‘Connected to MongoDB’ in the console. You can also use a MongoDB client to verify that the connection has been established.
Conclusion
In this tutorial, we learned how to create a server-side web app using Node JS and Express JS, and how to connect to a MongoDB database. By following these steps, you can start building powerful and scalable web applications with ease.
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Really helpful video 👌👍👍
Great explanation!