How to make jupyter run in the background as systemd unit

$ cat /etc/systemd/system/jupyter.service
[Unit]
Description=Jupyter server
[Service]
Type=simple
ExecStart=/home/razzi/.local/bin/jupyter-notebook
WorkingDirectory=/home/razzi/notebooks
User=razzi
Group=razzi

[Install]
WantedBy=default.target

Then

sudo systemctl start jupyter

To get the token, see

journalctl -u jupyter.service