Setting up and running a time-zone-server on Raspberry pi

I had not done NPM install. So I did:
npm install npm@latest -g

There is a directory node_modules at:
/home/pi/node/node-v6.17.1-linux-armv7l/lib/node_modules

Still appears to be missing "express."

Installed express. The Server is working now.

pi@raspberrypi:~/time-zone-server $ cat log.txt
Listening on port 3000...

Thanks! I'll have a go at the cron job now...

I set up cron job per Ian's post. Not working. Here is the error file:

pi@raspberrypi:~/time-zone-server $ cat cron.err
nohup: failed to run command 'node': No such file or directory

Here is the run.sh file:
pi@raspberrypi:~/time-zone-server $ cat run.sh
cd /home/pi/time-zone-server/
nohup node time-zone-service.js > log.txt &2>1
#nohup node time-zone-service.js >> tzs.log &

??