How to Install/Uninstall NodeJS on Ubuntu 18.04

NodeJS is a JavaScript framework that allows you to build fast network applications with ease. In this guide, we delve in and see how you can How to install NodeJS on Ubuntu 18.04.

Step 1: Adding the NodeJS PPA to Ubuntu 18.04

To start off, add the NodeJS PPA to your system using the following commands.

sudo apt-get install software-properties-common

Sample Output Next, add the NodeJS PPA.

curl -sL https://deb.nodesource.com/setup_11.x | sudo -E bash -

Sample Output Great! In our next step, we are going to run the command for installing NodeJS.

Step 2: Install NodeJS on Ubuntu

After successfully adding the NodeJS PPA, It’s time now to install NodeJS using the command below.

sudo apt-get install nodejs

Sample Output This command not only installs NodeJS but also NPM (NodeJS Package Manager) and other dependencies as well.

Step 3: Verfiying the version of NodeJS and NPM

After successful installation of NodeJS, you can test the version of NodeJS using the simple command below.

node -v

Sample Output For NPM, run

npm -v

Sample Output

Step 4: Creating a Web Server demonstration

This is an optional step that you can use to test if NodeJS is working as intended. We are going to create a web server that displays the text “Congratulations! node.JS has successfully been installed !” Let’s create a NodeJS file and call it nodeapp.js

vim nodeapp.js

Add the following content

var http = require('http');
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Congratulations! node.JS has successfully been installed !\n');
}).listen(3000, " server-ip);
console.log('Server running at https://server-ip:3000/');

Save and exit the text editor Start the application using the command below

node nodeapp.js

Sample Output This will display the content of the application on port 3000. Ensure the port is allowed on the firewall of your system.

ufw allow 3000/tcp
ufw reload

Now open your browser and browse the server’s address as shown

https://server-ip:3000

Uninstall NodeJS from Ubuntu

If you wish to uninstall NodeJS from your Ubuntu system, run the command below.

sudo apt-get remove nodejs

The command will remove the package but retain the configuration files. To remove both the package and the configuration files run:

sudo apt-get purge nodejs

As a final step, you can run the command below to remove any unused files and free up the disk space

sudo apt-get autoremove

Great! We have successfully installed and tested the installation of NodeJS. We also learned how to uninstall NodeJS from Ubuntu and clean up space.