savebase64AsFile.js

function savebase64AsFile(folderPath, fileName, base64, contentType){
    var DataBlob = b64toBlob(base64,contentType);
    window.resolveLocalFileSystemURL(folderPath, function(dir) {
        dir.getFile(fileName, {create:true}, function(file) {
            file.createWriter(function(fileWriter) {
                fileWriter.write(DataBlob);
                fileWriter.onwrite = function(){
                    console.log('File written successfully.');
                }
            }, function(){
                alert('Unable to save file in path '+ folderPath);
            });
        });
    });
}