A small upstart script I can use as a template. Edit it, and put it in /etc/init.

myapp.conf

#!upstart
description "My Application's description here."
author      "Chris Case <[email protected]>"

# Depending on what this is, you mat consider `start on started network-services`
start on startup

# May not need a stop on clause
stop on shutdown

respawn

# Should probably setuid to whatever _unprivledged_ user was setup to run this app, like `www-data`.
setuid root

script
    cd /opt/docserver/dox-generator
    exec npm start
end script