Express

Installation

To install Express, you need to have Node.js and npm installed. If you don't have them installed, you can download and install them from the official website: Node.js.

To install Express, run the following commands:

1. Create a directory for your project:

mkdir my-express-app
cd my-express-app

1. Initialize a new Node.js project:

npm init -y

1. Install Express:

npm install express

Hello World Example

Create a file named app.js and add the following code to set up a basic Express server with a "Hello World" route:

const express = require('express');
const app = express();
const port = 3000;

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

app.listen(port, () => {
    console.log(`Example app listening at http://localhost:${port}`);
});

To run the server, use the following command:

node app.js

You should see the message Example app listening at http://localhost:3000 in your terminal. Open your browser and navigate to http://localhost:3000 to see the "Hello World!" message.