Calling a custom web API secured with Azure AD from SharePoint 2019 on-premise

Question

I need to call custom web APIs secured with Azure AD from my SharePoint 2019 on-premise SharePoint Framework solutions. As far as I know, this scenario and calling graph APIs are only supported in SharePoint Online.

I was following the article. It has mentioned to add webApiPermissionRequests key in package-solution.js. But, after adding the webApiPermissionRequests key, package failed to deploy in app catalog with error "Error in the application".

Answer 1

On-prem SharePoint uses SPFx 1.4.1, so you cannot use AadTokenProvider, meaning you need to use ADAL JS, see instructions here.

webApiPermissionRequests refers to AadTokenProvider which in turn requires SPFx 1.6.0+, thus is not currently supported on on-prem SP.