Upgrade Node.js via NPM

upgrade-node.js-via-npm.md

Use n module from npm in order to upgrade node

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

sudo ln -sf /usr/local/n/versions/node//bin/node /usr/bin/node

To upgrade to latest version (and not current stable) version, you can use

sudo n latest

To undo:

sudo apt-get install --reinstall nodejs-legacy     # fix /usr/bin/node
sudo n rm 6.0.0     # replace number with version of Node that was installed
sudo npm uninstall -g n

Found in David Walsh blog http://davidwalsh.name/upgrade-nodejs