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The SharePoint Add-in portions of this article are legacy guidance. The retirement below doesn't retire the other APIs or platforms discussed here.
Important
SharePoint Add-ins reached end of life in SharePoint Online on April 2, 2026. Both SharePoint-hosted and provider-hosted Add-ins are retired and no longer work in SharePoint Online, including government clouds. Add-in development, deployment, and usage guidance is retained for historical reference and for applicable SharePoint Server scenarios, not for new SharePoint Online solutions.
SharePoint Server Add-ins deployed through an on-premises app catalog are not retired by this change. Acquiring SharePoint Add-ins from the public marketplace ended on April 2, 2026 for SharePoint Server.
This retirement does not retire SharePoint REST APIs, CSOM, JSOM, or SharePoint Framework (SPFx). For SharePoint Online, use SPFx for user interface extensions and Microsoft Entra ID for authentication to external applications. See the retirement announcement and Add-in migration guidance.
The articles in this section show you how to improve the security and performance of your SharePoint sites. The following table lists the articles that are included.
| Article | Shows you how to use the add-in model to |
|---|---|
| Authorize provider-hosted add-in users at run time | Provide authorized access to SharePoint resources by using OAuth in provider-hosted apps at run time. |
| Authorization considerations for tenants hosted in the Germany, China or US Government environments | When your Office 365 tenant is hosted in an specific environment like the Germany, China or US Government environments then you'll need to take this in account when you're developing against your tenant. |
| Cross-domain images in SharePoint provider-hosted add-ins | Use images across domains in provider-hosted apps. |
| Elevated privileges in SharePoint Add-ins | Use the app-only policy or service accounts to elevate privileges in SharePoint Add-ins. |
| How to provide add-in app only tenant administrative permissions in SharePoint Online. | Granting tenant permissions for app-only authorization requires some changes to the regular app-only authorization setup. |
| Set external sharing in Office 365 | Allow external users to access your site collection. |
| JavaScript Patterns and Performance | Learn which JavaScript techniques you can use to improve your add-in performance. |