How to install?

[greatidea1]

Hi contributors,
I tried installing the server part and faced errors.

I did git cloned https://github.com/colloqi/rpi-remote-ssh it in my /home directory,
cd into termjs directory and then 'node server.js 7777' it said express not found,
so I copy-pasted the full $ node server.js 7777 and got error $command not found.
Next I tried 'npm install' which went on for a while and the "express not found" error went away, but now there are errors which point to individual files

By this explanation, can you find out what may be wrong?
I'm trying this on Ubuntu 18.04 LTS