once the environment is set up, is it possible to create a Cross-Domain JSOM or REST calls to get data from Site Collections from Both On-Prem and Online Sides using the SharePoint Hosted App Add-in model ?

  • Why JSOM and not CSOM in C#? Do you need to make app-only calls to the site collections? – Kevin Stone Jul 14 '17 at 1:58
  • we are moving away from C# CSOM as we are planning to move fully to Online and we don't want to depend on Provider hosted add-ins – mike Jul 24 '17 at 17:53

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