Setting up Express JS Development Environment

Express is a popular web application framework for Node.js that allows you to build efficient and scalable server-side web applications. In order to start developing with Express, you need to set up your development environment properly. Here are the steps to do so:

Step 1: Install Node.js and npm

Before you can start using Express, you need to have Node.js and npm (Node Package Manager) installed on your system. You can download and install them from the official Node.js website.

Step 2: Create a New Node.js Project

Once you have Node.js and npm installed, you can create a new Node.js project by running the following command in your terminal:

$ npm init

Step 3: Install Express

Next, you need to install Express in your project. You can do this by running the following command:

$ npm install express --save

Step 4: Create an Express Application

Now that you have Express installed, you can create a new Express application by creating a new file, for example app.js, and adding the following code:

const express = require('express');
const app = express();

app.get('/', (req, res) => {
  res.send('Hello World!');
});

app.listen(3000, () => {
  console.log('App listening on port 3000');
});

Step 5: Run Your Express Application

Finally, you can run your Express application by running the following command in your terminal:

$ node app.js

Your Express application should now be running on http://localhost:3000. You can access it in your web browser and see the “Hello World!” message.

That’s it! You have successfully set up your Express JS development environment. Now you can start building your web applications using Express.