Is there a way to obtain the JSON using a HTTP request? I've written a tool to convert these into isometric and would love to be able to do it all in one click rather than having to manually save it.
Nope. Something somewhat similar used to be implemented in MFCG. Adding a specific URL parameter made a generator to save a generated map right after loading. It is not hard to implement here but I guess this is not what would help you?
