Export JSON to CSV file using Javascript

json_to_csv.js

function convertToCSV(objArray) {
    var array = typeof objArray != 'object' ? JSON.parse(objArray) : objArray;
    var str = '';

    for (var i = 0; i < array.length; i++) {
        var line = '';
        for (var index in array[i]) {
            if (line != '') line += ','

            line += array[i][index];
        }

        str += line + '\r\n';
    }

    return str;
}

function exportCSVFile(headers, items, fileTitle) {
    if (headers) {
        items.unshift(headers);
    }

    // Convert Object to JSON
    var jsonObject = JSON.stringify(items);

    var csv = this.convertToCSV(jsonObject);

    var exportedFilenmae = fileTitle + '.csv' || 'export.csv';

    var blob = new Blob([csv], { type: 'text/csv;charset=utf-8;' });
    if (navigator.msSaveBlob) { // IE 10+
        navigator.msSaveBlob(blob, exportedFilenmae);
    } else {
        var link = document.createElement("a");
        if (link.download !== undefined) { // feature detection
            // Browsers that support HTML5 download attribute
            var url = URL.createObjectURL(blob);
            link.setAttribute("href", url);
            link.setAttribute("download", exportedFilenmae);
            link.style.visibility = 'hidden';
            document.body.appendChild(link);
            link.click();
            document.body.removeChild(link);
        }
    }
}

var headers = {
    model: 'Phone Model'.replace(/,/g, ''), // remove commas to avoid errors
    chargers: "Chargers",
    cases: "Cases",
    earphones: "Earphones"
};

itemsNotFormatted = [
    {
        model: 'Samsung S7',
        chargers: '55',
        cases: '56',
        earphones: '57',
        scratched: '2'
    },
    {
        model: 'Pixel XL',
        chargers: '77',
        cases: '78',
        earphones: '79',
        scratched: '4'
    },
    {
        model: 'iPhone 7',
        chargers: '88',
        cases: '89',
        earphones: '90',
        scratched: '6'
    }
];

var itemsFormatted = [];

// format the data
itemsNotFormatted.forEach((item) => {
    itemsFormatted.push({
        model: item.model.replace(/,/g, ''), // remove commas to avoid errors,
        chargers: item.chargers,
        cases: item.cases,
        earphones: item.earphones
    });
});

var fileTitle = 'orders'; // or 'my-unique-title'

exportCSVFile(headers, itemsFormatted, fileTitle); // call the exportCSVFile() function to process the JSON and trigger the download

If anyone is using this code, consider changing line 10 to: line += '"' + array[i][index] + '"';
If you have strings with commas in them, this will prevent the commas in the strings from splitting the content into different cells.
See this post: https://stackoverflow.com/a/4617967/3593621

FileName will allways be undefined.csv
Here's a fix:

  var exportedFilenmae = (fileTitle || "export") + ".csv" ;

Can remove headers as input by doing this
exportCSVFile: function (jArray, fileName) { jArray.unshift(Object.keys(jArray[0]));

minified
jArrayToCSV: function (d) { var c = typeof d != 'object' ? JSON.parse(d) : d; var e = ''; for (var a = 0; a < c.length; a++) { var b = ''; for (var f in c[a]) b != '' && (b += ','), b += '"' + c[a][f] + '"'; e += b + '\r\n'; } return e; }, exportCSVFile: function (jArray, fileName) { jArray.unshift(Object.keys(jArray[0])); var f = JSON.stringify(jArray); var g = this.jArrayToCSV(f); var b = (fileName || 'export') + '.csv'; var c = new Blob([g], { type: 'text/csv;charset=utf-8;' }); if (navigator.msSaveBlob) navigator.msSaveBlob(c, b); else { var a = document.createElement('a'); if (a.download !== undefined) { var h = URL.createObjectURL(c); a.setAttribute('href', h), a.setAttribute('download', b), a.style.visibility = 'hidden', document.body.appendChild(a), a.click(), document.body.removeChild(a); } } }