From 0 to 60 or how I refactored an Office Add-in from a web page hosted in SharePoint to an application using Node.js, CORS and Office 365 API

After building SharePoint solutions for a few years I tried building an Office Add-in querying the Office Graph. Here is what I learned. 0 mph I've been working with the Office Graph for a while now. One of the early days I got the idea of building an Office Add-in