var obj = {

 6:{"name":"Mary", "status":true},

 2:{"name":"Mike", "status":true},

 1:{"name":"John", "status":false},

 4:{"name":"Mark", "status":true},

 5:{"name":"Jane", "status":false}

};

var count = 0;

for (var prop in obj) {

  if(obj[prop]["status"] == true){

   count += 1; 

  }

}

​

​

​

$("#debug").text("Output: "+count);

​