<!DOCTYPE html>
<html>
<body>
<a id="href" href="simple.html">download</a>
<script>
    var element = document.getElementById("href");
    var data = { x: 42, s: "hello, world" };
    var json = JSON.stringify(data);
    var blob = new Blob([json], {type: "octet/stream"});
    var url = window.URL.createObjectURL(blob);

    element.href = url;
    element.click();
</script>
</body>
</html>