API calls with badly parsed JSON should be caught gracefully

[timwaters]

{"data":{"type":"gcps","attributes":{"x":notANumber, "y":2,"lat":33.3,"lon":44.4,"map_id":2}}}
F, [2016-06-10T15:52:36.655067 #25856] FATAL -- :
ActionDispatch::ParamsParser::ParseError

[timwaters]

This is catching at the middleware level, and not in the application. I think its going to be a good idea to catch for all miss parsed json. So will change title