

If you use a text editor or IDE other than Visual Studio to develop your add-in, you need to update the references to the content delivery network (CDN) for Office.js and the version of schema referenced in your add-in's manifest. During installation you'll need to select the Office/SharePoint development workload. To download Visual Studio, see the Visual Studio IDE page.

If you use Visual Studio to develop your add-in, to use the newest API members of the Office JavaScript API and the v1.1 features of the add-in XML manifest (which is validated against offappmanifest-1.1.xsd), you need to download the latest version of Visual Studio. However, there are occasional minor updates to version 1.1 that you can apply by using the techniques in this article. Projects created in Visual Studio 2019 or later will already use version 1.1.
