Logging is a very important component of any web application. We need a way of preserving the history of the server so that we can come back any time and see how it was serving requests.

And, most of all, you don't want logging to be an afterthought, only being implemented after you come across a production bug that makes your web app crash when you are trying to figure out where the problem is exactly.

Hapi.js has a minimal logging functionality built in, but if you need an extensive one, a good example is called good (https://github.com/hapijs/good).