Node js Installation
To create Node.js application, first we need to download and install Node.js. Node.js installable archive file is available on its official site for different OS.
https://nodejs.org/en/download/
Download and install the archive file that suitable for your OS.
The steps to install Node.js on windows machine
To install Node.js on window system, download the latest (msi) version of either 32 bits or 64 bits. It's depend upon what platform you are using.
Double click on msi file to install the Node.js.

On this window, you can change the destination folder name.

The steps to install Node.js on Linux, Mac OS X and SunOS machine
To install Node.js on Linux/Mac OS X/SunOS system, download the latest (msi) version of either 32 bits or 64 bits. It's depend upon what platform you are using. Extract the downloaded file and move to the desired location and set the PATH environment variable. Like -
export PATH=$PATH:/usr/local/nodejs/bin