How to install specific Node JS version on Ubuntu ?

To install specific version of Node JS, first make sure NPM package manager is installed.

 $ sudo apt-get install npm o 
 $ sudo npm install n -g

You can check what is your current Node JS version using below command,

 $ node -v

Also check which all node versions are supported by using below command,

 $ n ls

Changing to specific node version as you want.

Now, lets say if you have seen latest node version is 9.4.0 and want to install “6.8.1” version, which is actually a downgrading of Node JS version then you can use below command and pass the version number to “n” command as,

 $ sudo n 6.8.1

Now, you can see version 6.8.1 is installed,

 $ node -v

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