How to Upgrade (or Downgrade) Node.js using NPM

https://www.abeautifulsite.net/how-to-upgrade-or-downgrade-nodejs-using-npm

Upgrading to the latest stable version

This will update you to the latest available stable version:

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

Upgrading to the latest LTS version

Node also offers a long-term support (LTS) version. If you need that version (or any other), simply specify the version number you want:

sudo npm cache clean -f
sudo npm install -g n
sudo n 4.4.2

Checking your Node version

To see which version of Node is currently installed, simply run:

node -v