https://nodejs.org/en/download/
Download Linux Binaries.
cd /usr/local
tar --strip-components 1 -xf /path/to/downloaded/tar/node-vYOURVERSION-linux-x64.tar.xz
node -v
npm --version
http://www.thegeekstuff.com/2015/10/install-nodejs-npm-linux/