/etc/init.d/nodeapp

etc init.d nodeapp.sh

#!/bin/bash
DIR=/var/www/YOUR_NODE_APP_GOES_HERE
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
NODE_PATH=/usr/local/lib/node_modules
NODE=/usr/local/bin/node

test -x $NODE || exit 0

function start_app {
  NODE_ENV=production nohup "$NODE" "$DIR/YOUR_APP_SERVER_FILE.js" 1>>"$DIR/logs/YOUR_APP_NAME.log" 2>&1 &
  echo $! > "$DIR/pids/YOUR_APP.pid"
}

function stop_app {
  kill `cat $DIR/pids/YOUR_APP.pid`
}

case $1 in
   start)
      start_app ;;
    stop)
      stop_app ;;
    restart)
      stop_app
      start_app
      ;;
    *)
      echo "usage: YOUR_APP_NAME {start|stop}" ;;
esac
exit 0

@umpitygrumpity an example:

su specuser -c "nohup npm start /home/user/app/ 1>>/home/user/app/out.log 2>&1 &"