rexrainbow - it appears that the json file that tiled is creating doesn't work with the v2 json importer anymore.
I notice that compared to your example file, all attributes in your json example data have 2 "" around them, where as tiled only puts 1 around each one. eg: "height" etc
Tiled map Editor 0.10.1
Json TMX parser
TMX importer v2
Rexrainbow's sample capx for the importer
steps to reproduce -
1) In tiled map editor goto file save as "type json"
2) try to copy json file into example capx -> multiple errors complaining about only 1 " around attributes in json
perhaps the plugin just needs to be updated to work with the latest version of tiled?