JSON to CSV

jsonToCsv.js

//Data for testing it
var dataobject = {
	rows:[
		{Preis:"100",Geraet:"Android Phone"},
		{Preis:"600",Geraet:"iPad"},
		{Preis:"1000",Geraet:"Thinkpad"}
	]
};

//get all column names. Use the first object in rows for that.
// we write it in a variable here as an array so we can ensure the same order every time we collect the keys.
var colnames = Object.keys(dataobject.rows[0]);

//GETS:
// colnames: an array with column names as strings: ["name2", "name2",…]
// lineObject: An object with keys/values. Keys need to be  corresponding to the strings in colnames.
//RETURNS:
// an array with all values from lineObject in order of the keys in colnames
var getSingleLineArray = function(colnames,lineObject){
	var lineArray =[];
	colnames.forEach(function(currentColName){
		lineArray.push(lineObject[currentColName]);
	});
	return lineArray;
};


//Gets an array in which each item is an object with key/value pairs. Each key signifies a table column name, each value a value/cell in a table.
var csv = dataobject.rows.reduce(function(prevVal, objectRow){
	var lineArray = getSingleLineArray(colnames, objectRow);
	var lineConcat = lineArray.join(",")+"\n";
	return prevVal+lineConcat;
},colnames.join(",")+"\n");

console.log(csv);
/*
Preis,Geraet
100,Android-Phone
600,iPad
1000,Thinkpad

*/