Mongo Depth finder

Mongo.finder.js

db.users.find({
    $where : function(){
        var item = 'Location';
        var value = '501';

        var drillDown = function(obj){
          for(var k in obj) {
            if(typeof obj[k] == 'object' && obj[k] !== null){
              if(drillDown(obj[k])) {
              return true;
            }
          } else if(k == item && obj[k] == value) {
              return true;
            }
          }
          return false;
        }
        return drillDown(this);
    }
})