Hi!
- Four of my generators support JSON export: MFCG, VG, NG and 1PDG. MFCG, VG and NG use the same type of JSON (with buildings, roads, tree etc.), but only MFCG accepts the export url parameter. 1PDG uses a different type of JSON and it also recognizes the export parameter.
- All of the Arcana generators can be parameterized via url variables, usually by requesting specific tags. For example this should give you an isolated densely built village of the default size.
- Could you send me a link that gives you that error? Adding export=... should work.