Filter json data and take according to user want.

filterJson.js

function filterJsonData(data,rules,take,callback){
	var i = 0;
	var _data = data;
	var _newDataSet = [];

	take = (take == undefined) ? _data.length : take;

	while(i < take){
		Object.keys(_data[i]).forEach(function(ele){
			(rules.indexOf(ele) === -1) ? delete _data[i][ele] : false;
		});
		_newDataSet.push(_data[i]);
		i++;
	}
	callback(null,_newDataSet);
}

// with random index taking
function filterJsonDataByRandomTake(data,rules,take,callback){
    var _data = data;

    take = (take == undefined) ? Math.floor(Math.random() * _data.length) : take;
	
    Object.keys(_data[take]).forEach(function(ele){
      (rules.indexOf(ele) === -1) ? delete _data[take][ele] : false;
    });
    
    callback(null,_data[take]);
}

filterJsonData(jsonData,['code','dial_code'],10,function(err,data){
	console.log(data)
})