How to get spreadsheet data to the server

I’ve gone through the documentation and many items in this forum topic but cannot find the answer. To get data from the web server to the form, I can use JSON. How do I get the information back to the server to process and save the changes? Am I using a FORM POST? Do I need to use Ajax or sockets? I can’t find anything that explains sending the data back to the server for processing.

Can anyone please point me to the correct documentation or post topic to show this?

Pretty please.

You may serialize your spreadsheet data to a json object:

And send this object to your backend.
It is described her:

Thank you for sharing that information. I’ll look at it.