JSONToCSVConvertor.js

function JSONToCSVConvertor(JSONData, ReportTitle, ShowLabel) {
    //If JSONData is not an object then JSON.parse will parse the JSON string in an Object
    var arrData = typeof JSONData != 'object' ? JSON.parse(JSONData) : JSONData;

    var CSV = '';
    //Set Report title in first row or line

    CSV += ReportTitle + '\r\n\n';

    var currentDate = new Date();

    CSV += currentDate + '\r\n\n';

    //This condition will generate the Label/Header
    if (ShowLabel) {
        var row = "";

        //This loop will extract the label from 1st index of on array
        for (var index in arrData[0]) {

            //Now convert each value to string and comma-seprated
            row += index + ',';
        }

        row = row.slice(0, -1);

        //append Label row with line break
        CSV += row + '\r\n';
    }

    //1st loop is to extract each row
    for (var i = 0; i < arrData.length; i++) {
        var row = "";

        //2nd loop will extract each column and convert it in string comma-seprated
        for (var index in arrData[i]) {
            row += '"' + arrData[i][index] + '",';
        }

        row.slice(0, row.length - 1);

        //add a line break after each row
        CSV += row + '\r\n';
    }

    if (CSV == '') {
        alert("Invalid data");
        return;
    }

    //Generate a file name
    var fileName = "";
    //this will remove the blank-spaces from the title and replace it with an underscore
    fileName += ReportTitle.replace(/ /g, "_") + ".csv";
    
    //Initialize file format you want csv or xls
    // Set UTF-8 formatting
    var uri = "\uFEFF" + CSV;
    
    // Now the little tricky part.
    // you can use either>> window.open(uri);
    // but this will not work in some browsers
    // or you will not get the correct file extension
    var blob = new Blob([uri], {type: 'text/csv;charset=utf-8;'});
    if (navigator.msSaveOrOpenBlob) {
        navigator.msSaveBlob(blob, fileName);
    } else {
        //this trick will generate a temp <a /> tag
        var elem = window.document.createElement('a');
        elem.href = window.URL.createObjectURL(blob);
        elem.download = fileName;
        document.body.appendChild(elem);
        elem.click();
        document.body.removeChild(elem);
    }
}