Tableau has the ability to connect to dozens of data sources directly. A full list of supported data sources can be found here: All Technical Specifications | Tableau Software
Tableau has a few options for connecting to other data sources that are not included as a named connector in the Tableau Desktop product.
For connecting to JSON formatted data we have the following options available:
In Tableau Desktop 9.1 - 10.2, use the Web Data Connector (Web Data Connector) which can connect to JSON data that is accessible by HTTP.
I hope this helps!
Thanks for the reply, I'm actually questioning about going the other direction. I'd like to connect to a Tableau Server Data Source and get the data out as JSON or something similar.