# How to install, manage Node.js on Ubuntu and additional tips

`Node.js` is a JavaScript runtime built on Chrome's V8 engine that helps to build scalable applications. As a web developer, you may find Node.js as omnipresent irrespective of client-side or server-side development. It provides and supports the NPM(Node Package Manager) environment that is widely used today.

On the other side, `Ubuntu` is an open-source operating system on Linux. It is available for the hobbyist, enterprises, desktops, and the cloud. In this article, we will learn to install, manage Node.js on the Ubuntu operating system so that you can quickly run a web application.

## Let's clarify a few terminologies
> Please feel free to skip this section if you are already aware or want to directly get to the installation commands.

It's essential to clarify a few terminologies around Node.js and Ubuntu. Usually, these terminologies are used as shortcuts and could be confused to a beginner.

- **Node.js Versioning:** One of the things I was confused about initially was Node.js versioning. So thought of explaining it a bit here. On the [download page](https://nodejs.org/en/download/), you will find two types of versions, `LTS` and `Current`.

 ![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1626666985125/gN2Z_JwaR.png)
 *Image Courtesy: https://nodejs.org/en/download/*

 The term LTS stands for `Long Term Support`. The releases with this version focused on stability and security. If you plan to use Node.js in an enterprise app, you may opt for an LTS version.

 The `Current` version is the Node.js release under active development for an upcoming major release. There is also a `Nightly` build available every 24-hours when there are changes.

- **Ubuntu LTS Version:** Similarly, Ubuntu also has the LTS(Long Term Support) versions like `Ubuntu 20.04 LTS` that releases every two years in April. Here also, the LTS releases are suitable for enterprises. You may find this image helpful in understanding Ubuntu's release cycles, versioning.

 ![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1626666871116/RQyHKDeIF.png)
 *Image Courtesy: https://ubuntu.com/about/release-cycle*

- **Ubuntu PPA:** `PPA` is the short form of `Personal Package Archive`. It allows you to upload Ubuntu source packages to be published as an `apt` repository. The `apt` is Advanced Package Tool that helps to install, remove apps on Ubuntu.

 As you must have guessed now, [Node.js PPA](https://github.com/nodesource/distributions#deb) is available to use for installing it on the Ubuntu operating system. If you are inserted in knowing other PPAs, you can search [them here](https://launchpad.net/ubuntu/+ppas).

## Install Node.js on Ubuntu
We can install Node.js on  Ubuntu in a couple of ways.
- Manually by adding the Node.js PPA and use the apt command-line tool to install.
- Using a tool called Node Version Manager(NVM).

We will see both. First, using the Node.js PPA.

[curl](https://curl.se/) is a command-line utility to transfer data over the network. Let us use curl to get the Node.js PP downloaded. But before that, let's install curl(assuming it is not installed already).

```shell
sudo apt-get install curl 
```
The above command will install `curl`. Now use the following command to get the Node.js PPA and add it to the local system.

```shell
curl -sL https://deb.nodesource.com/setup_16.x | sudo -E bash - 
```
The `s` and `L` switch of curl shows an error if the request fails and follows the HTTP redirects. Now, we can use the apt tool to install Node.js.

```shell
sudo apt-get install nodejs 
```
That's all. You have installed Node.js successfully on ubuntu. To check its presence, you can query the version of it,

```shell
node -v
```
The Node.js comes with the `npm` utility. Please check its version as well to confirm the availability.

```shell
npm -v
```
## Node Version Manager(NVM) on Ubuntu
You may want to keep your environment up-to-date with the latest Node.js releases. At times, some external libraries may work only with a specific version of Node.js. In these situations, you need to have multiple versions of Node.js installed on your operating system. It would help if you also could switch between these versions based on your needs. The Node Version Manager(NVM) tool helps you achieve that.

### Install NVM on Ubuntu
It would be best if you used the [install script](https://github.com/nvm-sh/nvm/blob/v0.38.0/install.sh) to install or update NVM. We will use the `curl` utility to download and use the script. Run the following command from your Ubuntu terminal,

```shell
curl https://raw.githubusercontent.com/creationix/nvm/master/install.sh | bash 
```
It will fetch the latest stable version of NVM for installation. If you are looking for a specific version of NVM, replace the `master` with the version number in the above URL. For example, 

```shell
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.38.0/install.sh | bash
```
The above command downloaded and installed the nvm tool. You can re-login to load nvm in your environment or use the following command to do the same,

```shell
source ~/.profile 
```
If you faced any trouble, please check the [additional notes](https://github.com/nvm-sh/nvm#additional-notes) from here. Now you have the nvm tool installed and ready to use.

### Install Node.js using NVM
You can install Node.js using the NVM tool. To install the latest version of Node.js use,

```shell
nvm install node
```
To install a specific version of Node.js use,

```shell
nvm install 16.0.0
```
It will install the Node.js version 16.0.0.

### List all the installed Node.js
You may install multiple versions of Node.js using NVM. If you want to list all the Node.js versions installed in the local operating system, please use the command,

```shell
nvm ls
```
If you want to list and view all the available node.js versions for installation, use this command.

```shell
nvm ls-remote
```

### Use a specific Node.js version
To use a specific Node.js version, use this command,

```shell
nvm use 10.0.0
```
It will now use the Node.js version 10.0.0 in your environment till you change it again. If you want to get to the path of the executable, try this,

```shell
nvm which 4.6
```

### Run a Node.js program with a specific version
It is handy when a Node.js program works on your environment but fails your customer's environment. You may want to quickly debug and check if a specific Node.js version is causing any issues. You can do it using NVM without any install/uninstall cycles.

Let's take a simple Node.js program, a simple server. Copy and paste the following code into a file and save it as `server.js`.

```js
var http = require('http');

http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello Awesome People\n');
}).listen(3000, "127.0.0.1");

console.log('Server running at http://127.0.0.1:3000/');
```
Now you can run the above program using a specific Node.js version using this command,

```shell
nvm exec 10.10.1 server.js 
```
Here we are executing the program using Node.js version 10.0.1.

## Bonus: Install Yarn on Ubuntu
[Yarn](https://yarnpkg.com/) is a package manager that is fast, secured, and gained lots of popularity in the last few years. You may want to handle the package management of your project using yarn instead of npm. In that case, you need to install `yarn` separately.

You can install the `yarn` tool multiple ways on a Ubuntu OS. You can install it using PPA, script, or just by using the `npm` command. As we have installed `npm` already, let's use the same to install yarn globally. 

Please use the command,

```shell
npm install -g yarn
```
It will install yarn globally on Ubuntu.

## Uninstall Node.js
At times, you may have to uninstall Node.js as well. You can do it using these commands.

Remove Node.js

```shell
sudo apt-get remove nodejs
```
Remove npm

```shell
sudo apt-get remove npm
```
Finally,

```shell
sudo apt-get update
```

If you uninstall Node.js using nvm,

```shell
nvm uninstall 12.7.0
```
Please make sure the related folder is not left out under the `.nvm` directory. If so, please remove manually,

```shell
cd ~/.nvm/versions/node
sudo rm -rf v12.7.0/
```

## In Summary
That's all for now, friends. In this article, we learned,
- A few basic terminologies around Node.js and Ubuntu
- How to install Node.js using PPA
- How to install Node Version Manager(NVM) and use it further to manage Node.js on Ubuntu.
- How to install the yarn package manager.
- Finally, how to uninstall Node.js completely.

Up next, we will learn how to host a Node.js application on ubuntu and make it secure using HTTPS. Please stay tuned. Are you looking for a video tutorial on the same topic? Please check it out 👇

%[https://www.youtube.com/watch?v=R_F0gYb8NgI]

<hr />
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