The property '__metadata' does not exist on type 'SP.Data.TasksListItem'
What causes it and how to fix it:
- Drop __metadata from write bodies — odata=verbose needs OData v3, and SPHttpClient sends v4Old-tutorial payloads 400 as plain JSON, and switching to odata=verbose 400s again under SPHttpClient, which sends odata-version: 4.0; write plain JSON without the type hint, or blank odata-version where the verbose form is really neededCause and fix →