CODE EXAMPLE FOR JAVASCRIPT

convert json / array to excel in javascript

//HTML
<button onclick="exportToCsv()">export to CSV</button>

// Javascript
var Results = [
  ["Col1", "Col2", "Col3", "Col4"],
  ["Data", 50, 100, 500],
  ["Data", -100, 20, 100],
];

exportToCsv = function() {
  var CsvString = "";
  Results.forEach(function(RowItem, RowIndex) {
    RowItem.forEach(function(ColItem, ColIndex) {
      CsvString += ColItem + ',';
    });
    CsvString += "
";
  });
  CsvString = "data:application/csv," + encodeURIComponent(CsvString);
 var x = document.createElement("A");
 x.setAttribute("href", CsvString );
 x.setAttribute("download","somedata.csv");
 document.body.appendChild(x);
 x.click();
}