Setting up CNCjs on a Raspberry Pi has a few steps which I've wrapped up in a simple setup script.
Start from a fresh installation of Raspbian Lite; no desktop needed since you'll access the CNCjs interface remotely from another computer.
Log into the pi directly using an attached monitor/keyboard.
download this repo:
curl -LJ https://github.com/PwnCNC/cncjs-pi/tarball/master -o cncjs-pi.tar.gz
Untar file:
tar xvf cncjs-pi.tar.gz
Rename directory... this is where you'll need to run ls to see what the dir name is...
in my case, it untarred as PwnCNC-cncjs-pi-efa0692, your directory may have a different trailing chars so rename it... mv PwnCNC-cncjs-pi-efa0692 cncjs-pi
then cd into that directory
cd /home/pi/cncjs-pi
run installation script:
sudo ./setup.sh