CODE EXAMPLE FOR JAVASCRIPT

json to csv

let myObj= [
  { "ean":1, "name":'prod1', "attibutes":[{"attr": 100,"color": "green"},{"attr": 200,"color": "red"}] },  
  { "ean":2, "name":'prod1', "attibutes":[{"attr": 100,"color": "white"},{"attr": 200,"color": "blu"}] }
];    

function toCsv(arrOfObj){
  // array of objects with nested objects
  // keys for arr of obj (rows) is numeric
  // key for elements of nested obj is a name
  // I transform each row in an array
  const csvString = [
    ...arrOfObj.map(item => [
       item.ean,
       item.name,
       //NO: passes 0:object,1:obj, Object.entries(item.attibutes).map(([k,v]) => `${k}:${v}`)
	   Object.keys(item.attibutes).map(row => [ Object.keys(item.attibutes[row]).map( elkey => elkey + ':' + item.attibutes[row][elkey]     )])
  ])]
   .map(e => e.join(";")) 
   .join("
");
console.log(csvString);  
return csvString;
}
//TEST
toCsv(myObj);