JS.Events.Key.Keycode2
window.onkeydown = function(evt) {
document.body.innerHTML += "key = " + evt.key + "<br>";
document.body.innerHTML += "code = " + evt.code + "<br><br>";
}
<!DOCTYPE html>
<html lang="en">
<head>
<title>key and keyCode</title>
<meta charset="utf-8"/>
</head>
<body>
<p>Press some keys on your keyboard and see the corresponding evt.key and evt.code values. If you are not using a QWERTY keyboard, notice that the values might be different. This is because an 'a' on an AZERTY keyboard, will correspond to the KeyQ code on the reference keyboard.</p>
<p> You typed:</p>
</body>
</html>