Monitor NodeJS app with New Relic

I would like to add observability to the demo app Let’s Chat. It is written in NodeJS and I am following this page to add the agent needed.

Modify package.json and add "newrelic": "latest", according to the alphabatical orders.
Modify app.js and add require('newrelic'); at the beginning of the file. In my case, I put it in front of the line require('colors');