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.

Microsoft recently announced a developer preview release supporting JavaScript to create custom functions directly in Excel. This addition moves beyond the existing Microsoft Office JavaScript API ...

At its Ignite conference, Microsoft today announced an update to Excel that brings a new JavaScript API to the venerable spreadsheet app. With this new API, developers will be able to create custom ...

At its Ignite conference, Microsoft today announced an update to Excel that brings a new JavaScript API to the venerable spreadsheet app. With this new API, developers will be able to create ...

Microsoft Excel is partnering with CCP to build a special Javascript API that will grant budding spacefarers the capability to export in-game data directly into Microsoft Office.

I mean, what could possibly go wrong? Last December, Microsoft published a Dev Center article that talked about using the new Excel JavaScript API to create add-ins for Excel 2016.

Microsoft's Excel team takes to Reddit to answer questions and reassure users that yes, you can open up more than one Excel window at the same time.