# echo '{"alfa": { "beta": null, "teata": null, "adfa": null, "n": {}, "ixi": {}, "marr": [1, 2] } }' | ./tidyup_json
{
   "alfa" : {
      "marr" : [
         1,
         2
      ]
   }
}


# echo '{"alfa": { "beta": null, "teata": null, "adfa": null, "n": {}, "ixi": {}, "marr": [null, null] } }' | ./tidyup_json
null



# echo '{"alfa": { "beta": null, "teata": null, "adfa": null, "n": {}, "ixi": {}, "marr": [null, null, 3] } }' | ./tidyup_json
{
   "alfa" : {
      "marr" : [
         3
      ]
   }
}


# echo '{"alfa": { "beta": { "gamma" : 3 } } }' | ./tidyup_json
{
   "alfa" : {
      "beta" : {
         "gamma" : 3
      }
   }
}


# echo '{"alfa": { "beta": { "gamma" : {} } } }' | ./tidyup_json
null



# echo '{"alfa": { "beta": { "gamma" : {} }, "nth": 9 } }' | ./tidyup_json
{
   "alfa" : {
      "nth" : 9
   }
}