# Get started with Node.js (Installation and Hello World Application)


Welcome to Javascript world.

The popularity of javascript has brought dramatically changed in app development paradigm. And server-side development revolution started with the Node.js. According to the [node.js](https://nodejs.org/en/) official site, Node.js is
> Asynchronous event driven JavaScript runtime, Node is designed to build scalable network applications.

## Agenda

In this article, we

1. Install Node.js in your system.

1. Run a `Hello world` application in your application.

## Installation

There are several ways to install node.js in your system.

* Using the official [Node.js](https://nodejs.org/en/) site.

* Using **nvm **(Recommended and we will discuss the procedure here in details)

## NVM

[nvm](https://github.com/nvm-sh/nvm/blob/master/README.md) is a Node Version Manager, available for Linux and Mac. Also, there is a version available for windows user from separate developers.

### *Linux/Mac User*

If you are a Linux or Mac user, stay with me. Windows user, please go to the next section.

Please install the `curl`if not installed.

```
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.34.0/install.sh | bash
```


Or `wget`, the preinstalled download manager

In case your Linux distro does not ship with `curl` use default `wget` download manager.

```
wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.34.0/install.sh | bash
```


Now set the environment variable and load `nvm`

```
export NVM_DIR="${XDG_CONFIG_HOME/:-$HOME/.}nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
```


Now, restart your terminal and update

```
source ~/.bashrc
```


So now, **nvm **must be installed in your system.

### *Windows User*

Go to the [download](https://github.com/coreybutler/nvm-windows/releases) page and install your machine.

## Verification

Linux/Mac user run the command

`command -v nvm`

This should output the `nvm`

## Usage

To install the latest version of node, just run

`nvm install node`

To install a specific version of node

`nvm install version`

Replace `version` with your desired `node version`

## Hello World

In this section, we will create a console app, `hello world`

Create a file in your machine named `index.js`

In your `index.js` file, write

`console.log('Hello World!!!');`

Go to terminal and run

`node index.js`

Voila!!, you just run your first node.js application.

Your terminal should output

`Hello World!!!`

## NVM Misc

Get available node.js list By,

`nvm ls-remote`

Switch to the specific node.js version by,

`nvm use version`

NB: Before switch to a specific version, install that version `nvm install version`

## Conclusion

Stay tuned and if there is a confusing term or something, make the response below. I will replay ASAP.