Save json to csv download.

saveToCSV.js

var blob = new Blob([csvString]);
if (window.navigator.msSaveOrOpenBlob)  // IE hack; see http://msdn.microsoft.com/en-us/library/ie/hh779016.aspx
    window.navigator.msSaveBlob(blob, "filename.csv");
else
{
    var a = window.document.createElement("a");
    a.href = window.URL.createObjectURL(blob, {type: "text/plain"});
    a.download = "filename.csv";
    document.body.appendChild(a);
    a.click();  // IE: "Access is denied"; see: https://connect.microsoft.com/IE/feedback/details/797361/ie-10-treats-blob-url-as-cross-origin-and-denies-access
    document.body.removeChild(a);
}