expressjsHow can I use Express.js to develop a web application?

Express.js is a popular web application framework for Node.js. It provides a robust set of features for building single and multi-page web applications. To use Express.js to develop a web application, you can follow these steps:

1. Install Express.js: npm install express
2. Create an Express.js app:

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

3. Define routes for your application:

app.get('/', function (req, res) {
  res.send('Hello World')
})

4. Start the server: app.listen(3000)
5. Open the application in a browser: http://localhost:3000

The output of the code in step 3 will be Hello World when the application is opened in a browser.

For more information on using Express.js to develop a web application, see the Express.js documentation.

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