JSFiddle - React, Tailwind, and code Playground

HTML

<input type='text' />
<span></span>

JavaScript

$('input').keydown(function(e) {
    var a=[8,9,13,16,17,18,20,27,35,36,37,38,39,40,45,46,91,92];
    var k = e.which;
    
    for (i = 48; i < 58; i++)
        a.push(i);
    for (i = 65; i < 91; i++)
        a.push(i);
    for (i = 96; i < 106; i++)
        a.push(i);
    
    if (!(a.indexOf(k)>=0))
        e.preventDefault();
    
    $('span').text('KeyCode: '+k);
});