I am playing around with NWE and found a map system I built that uses json files built with Tiled or any other tile based editor. I do not use it and would hate the work go to waste. Attached is a link to the module and the sql to import. It is very simple. It only uses one table and the rest are json files.
It is not 100% complete so remember it still needs work but do believe it works for the most part right out of the box