Installing Node.js and NPM in Ubuntu

Install Node.js and NPM

To do this, execute the terminal command:

$ sudo apt-get install -y nodejs
$ sudo apt-get install npm

If you have already installed Node.js, then yoou need check version of Node.js and the version of npm

$ nodejs -v

Currently, the latest version v5.10.1

Update Node.js and NPM

If you want to upgrade to the latest stable version, you must perform these commands:

$ sudo npm cache clean -f
$ sudo npm install -g n
$ sudo n stable

Now you have the latest stable version of the Node.js, if you need older version, you can change it with help special utility n

$ sudo n 0.8.21

Check npm, if it have the old version, then you can update it

$ npm -v
# the latest version 3.8.3
$ sudo npm install npm -g