SharePoint REST API is a powerful tool for updating lists and items in SharePoint, but determining the correct “__metadata” “type” for API calls can be confusing. While it’s typically “SP.Data.ListNameItem” based on the list’s URL, there are cases where it may be “SP.Data.ListNameListItem” in certain Office 365 tenants. In this article, we will explore how to find the correct “__metadata” “type” when updating lists or libraries in SharePoint, and also highlight the alternative approach of using the Microsoft Graph API. By understanding this crucial aspect of SharePoint REST API, readers can ensure successful updates and avoid potential errors.