Create a service for a node express app

gistfile1.txt

# first we have to create a file in this target:
sudo nano /etc/systemd/system/hereTheNameOfTheService.service

# inside that file we have to paste this:

[Unit]
Description=A Description of my service
After=network.target

[Service]
Environment="HTTP_PORT=8000"
Environment="HTTPS_PORT=4430"
Type=simple
User=username
Group=username
ExecStart=/usr/bin/node /home/username/app/index.js
ExecStop=kill -9 $(ps aux | grep '/usr/bin/node /home/username/app/index.js' | awk '{print $2}')
Restart=on-failure

[Install]
WantedBy=multi-user.target


# after that we have to set 'enabled' the service:
usudo systemctl enable hereTheNameOfTheService.service

# and finnally, we have to start the service
sudo systemctl start hereTheNameOfTheService.service