A barebones Node.js app using Express 4.
This application supports the [Getting Started with Node on Heroku]
A log file needs to be provided before Results button is clicked.
Hovering on donut chart displays the pageviews and user name in the centre of the donut/pie chart.
As this app is deployed using Heroku free account, if it doesn't receive traffic for 30 mins, the instance may sleep leading to slow response initially.