Node.js

Node.js is a way of running JavaScript on the server, but it's more than that.

1. A platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications.
2. Uses an event-driven, non-blocking I/O model that makes it lightweight and efficient.
3. Perfect for data-intensive real-time applications that run across distributed devices.

The steps of installing Node.js under hosting environment are:

1. Log in to your account using SSH. At the command prompt, type the following commands:

   cd ~
   export TMPDIR=~/tmp
   

2. To download the latest version of Node.js, type the following command:

   wget http://nodejs.org/dist/node-latest.tar.gz
   

3. To extract the Node.js files, type the following command:

   tar xvzf node-latest.tar.gz
   

4. To rename the Node.js folder to the more convenient nodejs name, type the following command. Replace X.X.X with the version number on your account:

   mv node-vX.X.X nodejs
   

5. To build and install Node.js, type the following commands:

   cd nodejs
   ./configure --prefix=~
   make
   make install
   

6. After these commands finish, Node.js is installed on your account.
7. We may need to set a path for node in ~/.bashrc:

   export PATH=$HOME/bin:$PATH
   

The installed files are:

Once Node.JS installed, we have an access to a new command called node. We can use the node command to execute raw JavaScript code:

$ node
> console.log('Hello World');
Hello World
undefined
> 

Another test:

$ node
> function testNode() {return "Node is working"}; testNode();
'Node is working'
> 

The most common way of running node is executing a JavaScript file (for example, hello.js):

console.log('Hello World');

$ node hello.js
Hello World

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