JSFiddle - React, Tailwind, and code Playground

HTML

<input class='validate' type='text'>

JavaScript

$(".validate").keyup(function(event) {
    var val = $(this).val();
    if (val.length > 5) {
        val = val.substring(0, 5);
        $(this).val(val);
        return false;
    }
}).keypress(function(event) {
    if ($(this).val().length > 4) {
        return false;
    }
});