What is NODE js & Install NODE js on linux using terminal

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NODE js :
Node.js is an open source, cross-platform runtime environment built on Chrome's V8 JavaScript engine for server-side and networking applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. Node.js applications are written in JavaScript.



Basic two ways to install node on linux --

 1.  Run the command 
Step 1: curl --silent --location https://deb.nodesource.com/setup_0.12 | sudo bash -
Step 2: sudo apt-get install --y nodejs

2. By using nvm :

 => RUN the command :
curl https://raw.githubusercontent.com/creationix/nvm/v0.11.1/install.sh | bash

nvm will be installed. and you will ask to close and reopen your terminal to start using NVM or you can acheived so by using this command :
source ~/.profile

And now you can use, nvm ls-remote.
If you have error, -bash: nvm: command not found, then install git by using apt-get install git

The nvm ls-remote will show all the versions of node, to install any listed version use nvm install version_name like nvm install 0.10.13

Now, if node is installed, type node --version to see the node version installed.

And, in future if you want to use another node version just type nvm install version_name
to install and then it will be switched to this new version.

If you later, switch to back to previous version just use nvm use version_name 
To see the node path type which node

* npm is by default installed, on installing NODE js
* The main reason for installing NODE by using NVM, is that it provide the switching capabilities among different versions

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