As I stated, Node.js can be used to build a web application. We can use the HTTP library to build a simple web server. Let's try to write the following code:

var http = require('http');

http.createServer(function (req, res) {
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.end('Hello Node.js');
}).listen(8056);
console.log('Server running at port 8056');

Save this code into a file named mywebserver.js. The http.createServer() function is used to create a web server with a specific port. In this case, I used port 8056.

Now you can run this file. Type the following command:

$ node mywebserver.js

To test this program, open a browser and navigate to http://<ip_address_raspberry_pi>:8056. You should see Hello Node.js in your browser as follows: