Using the Graph API to work with Excel is relatively easy; it’s a set of REST APIs with a common structure for all calls. This lets you quickly build URLs that access OneDrive locations, which ...

They can also call on data and calculations from Excel sheets for building reports and dashboards. Microsoft has partnered with two third-party services to make accessing this API easier.

Microsoft is opening up Excel to developers with a new JavaScript API. It will let developers use custom data types like images, cards, and arrays.