página de atualização de javascript quando o arquivo json muda

<html>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
    var previous = null;
    var current = null;
    setInterval(function() {
        $.getJSON("data.json", function(json) {
            current = JSON.stringify(json);            
            if (previous && current && previous !== current) {
                console.log('refresh');
                location.reload();
            }
            previous = current;
        });                       
    }, 2000);   
</script>
</html>
Comfortable Cockroach