expressjsHow do I use the Express.js API to create a web application?

To create a web application using Express.js API, you need to install the Express.js framework and its dependencies. After installation, you can create an Express.js application using the following code:

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

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

app.listen(3000, () => console.log('Server running on port 3000'))

This code will create a web application that will listen on port 3000 and will respond with "Hello World!" when it receives a GET request on the root URL.

The code contains the following parts:

1. The require('express') statement imports the Express.js library and assigns it to the express variable.
2. The express() statement creates an Express.js application and assigns it to the app variable.
3. The app.get() statement sets up a route handler for the root URL.
4. The res.send() statement sends a response with the given string.
5. The app.listen() statement starts the web server and listens on the given port.

Output example

Server running on port 3000

Helpful links

• Express.js Documentation
• Getting Started with Express.js

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