How to Install Node.js and NPM on Ubuntu 20.04

Node.js is an open-source, cross-platform JavaScript runtime environment for developing server-side scalable applications. The Node Package Manager (NPM) is an essential tool for managing libraries, dependencies, and scripts in a Node.js project. By installing Node.js and NPM on your server, you can use JavaScript as a server-side language.

This article explains how to install Node.js and NPM on Ubuntu 20.04. You will install both Node.js and NPM using the NodeSource PPA and run multiple versions using NVM (Node Version Manager) on your server.

Prerequisites

Before you begin:

• Have an Ubuntu 20.04 server.

• Access the server using SSH as a non-root user with sudo privileges.

• Update the server.

Choose a Node.js Version

When selecting a Node.js version for your project, consider factors like stability, performance, and application compatibility. Below are the supported Node.js release types:

• Latest Release: Features the newest updates, improvements, and functionalities. Ideal for applications needing the latest features.
• LTS Release: A stable, long-term release that receives critical updates and bug fixes. Best for production environments due to its reliability and extended support.

Factors to consider when choosing a release:

• Stability and Support: For production or reliable environments, the latest LTS release is recommended.
• Feature Requirements: For projects requiring the newest features or performance improvements, the latest release version is a good choice.

Install Node.js

The default Ubuntu 20.04 APT repositories may not have the latest version of Node.js. To install the most recent version, use the NodeSource PPA to add the latest repository for the specific Node.js version you want to install.

1. Update the server package index.

   console Copy

   $ sudo apt update
   

2. Download your desired Node.js version PPA installation script. For example, run the following command to use the Node.js version 22.x.

   console Copy

   $ curl -fsSL https://deb.nodesource.com/setup_22.x -o nodesource_setup.sh
   

   Visit the official NodeSource documentation to verify all available Node.js versions you can install on your server.

3. Run the Node.js setup script.

   console Copy

   $ sudo -E bash nodesource_setup.sh
   

4. Install Node.js and NPM using the following command.

   console Copy

   $ sudo apt-get install -y nodejs npm
   

5. View the installed Node.js version on your server.

   console Copy

   $ node -v
   

   Output:

   v22.14.0

6. View the installed NPM version on your server.

   console Copy

   $ npm -v
   

   Output:

   10.9.2

Test the Installation

1. Create a new project directory such as example-site.

   console Copy

   $ mkdir example-site
   

2. Switch to the directory.

   console Copy

   $ cd example-site
   

3. Initialize a new Node.js project using npm.

   console Copy

   $ npm init -y
   

4. Install the express module using npm.

   console Copy

   $ npm install express
   

5. Create a new index.js application file.

   console Copy

   $ nano index.js
   

6. Add the following code to the file.

   js Copy

   const express = require('express')
   const app = express()
   const port = 3000
   
   app.get('/', (req, res) => {
       res.send('Hello World! Greetings from Vultr')
   })
   
   app.listen(port, () => {
       console.log(`Example app listening on port ${port}`)
   })
   

   Save and close the file.

   The above Node.js code creates a new express application that listens for connections on the host port 3000 and outputs a Hello World! Greetings from Vultr message.

7. Allow port 3000 through the firewall to enable network connections to the application.

   console Copy

   $ sudo ufw allow 3000
   

8. Reload the firewall to apply changes.

   console Copy

   $ sudo ufw reload
   

9. Start the Node.js application.

   console Copy

   $ node index.js
   

10. Access your Node.js application using your server IP and port 3000 in a web browser such as Chrome.

    http://<server-ip>:3000

    

Install Multiple Versions with Node Version Manager (NVM)

NVM (Node Version Manager) is a handy tool for managing multiple Node.js versions on your server. You can install and switch between different Node.js versions based on your project needs. Follow the steps below to set up NVM and install the required Node.js versions.

1. Download the latest NVM installation script on your server.

   console Copy

   $ curl -O https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.7/install.sh
   

   Please, refer to the NVM documentation to get the latest version at the time of your installation.

2. Run the script to install NVM in your user environment.

   console Copy

   $ bash install.sh
   

3. Reload your server environment variables.

   console Copy

   $ source ~/.profile
   

4. List all available Node.js versions you can install on your server.

   console Copy

   $ nvm ls-remote
   

   Your output should look like the one below.

   ...
   v20.13.1   (LTS: Iron)
   v20.14.0   (Latest LTS: Iron)
   v21.0.0
   v21.6.0
   v21.6.1
   v21.6.2
   v21.7.0
   v21.7.1
   v21.7.2
   v21.7.3
   v22.0.0
   v22.1.0
   v22.2.0

5. Install a specific Node.js version. For example, Node.js 20.

   console Copy

   $ nvm install 20
   

6. List all installed Node.js versions and verify the default version on your server.

   console Copy

   $ nvm ls
   

   Output:

             v20.14.0
      ->      v21.7.3
      default -> 20 (-> v20.14.0)
      iojs -> N/A (default)
      unstable -> N/A (default)
      node -> stable (-> v21.7.3) (default)
      stable -> 21.7 (-> v21.7.3) (default)
      lts/* -> lts/iron (-> v20.14.0)

7. Run the following command to install a specific Node.js version such as 20 using NVM.

   console Copy

   $ nvm use 20
   

   Output:

   Now using node v20.14.0 (npm v10.7.0)

8. View the active Node.js version in your user environment.

   console Copy

   $ node -v
   

   Output:

   v20.14.0

9. View the NPM version in your user environment.

   console Copy

   $ npm -v
   

   Output:

   10.7.0

10. Run the following command to a specific version as the default Node.js version in your environment.

    console Copy

    $ nvm alias default 20
    

Conclusion

You have successfully installed Node.js and NPM on your Ubuntu 20.04 server. With the Node Version Manager (NVM), you can easily switch between different Node.js versions to meet your project's requirements.