Installing an auto-start Node.js service on a Raspberry Pi

demo.service

# https://nodesource.com/blog/running-your-node-js-app-with-systemd-part-1/
# https://medium.com/@simon_prickett/writing-a-systemd-service-in-node-js-on-raspberry-pi-be88d9bc2e8d

# WorkingDirectory= 
# This is the path to the node.js server files.
# If you don't add this in it will start the node server but try to look for files the server needs in the wrong folder.
# This means you just get an error.

# User=root
# Personal experience - sometimes a service has file read/write access with User=pi, but sometimes not.
# This doesn't seem to be a problem with User=root

# You can't copy the service file using the ftp software.
# The service file must be copied across to a "normal" area and then copied using:
# sudo cp SERVICENAME.service /etc/systemd/system

# Set the service up to run at start
# sudo systemctl enable SERVICENAME.service

# The service will run on start, but you can start it with:
# sudo systemctl start SERVICENAME


[Unit]
Description=Demo Service
After=network.target

[Service]
WorkingDirectory=/home/pi/Node/Demo
ExecStart=/usr/local/bin/node /home/pi/Node/Demo/app.js
Restart=on-failure
Type=simple
User=root
Environment=PORT=3001

[Install]
WantedBy=multi-user.target