function download(text, name, type) {
var a = document.getElementById("a");
var file = new Blob([text], {type: type});
a.href = URL.createObjectURL(file);
a.download = name;
}
click here to download your file
And you would then download the file by putting the download attribute on the anchor tag.
The reason I like this better than creating a data url is that you don't have to make a big long url, you can just generate a temporary url.