function downloadString(text, fileType, fileName) {
var blob = new Blob([text], { type: fileType });
var a = document.createElement('a');
a.download = fileName;
a.href = URL.createObjectURL(blob);
a.dataset.downloadurl = [fileType, a.download, a.href].join(':');
a.style.display = "none";
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
setTimeout(function() { URL.revokeObjectURL(a.href); }, 1500);
}
downloadString("a,b,c\n1,2,3", "text/plain", "String.txt")
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