I'd like to have a Page on SPO that enables my o365 site admin user to search all SPO site collections and sub sites by a string in the URL, Title and Home Page text.
What's the best platform/language to develop this in? Not sure if this is possible with client side code using CSOM. Does powershell offer an SPO interface that can do this?
Possible to develop a nightly powershell refresh of a SQL table and expose a webservice that searches that?