JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="iban" value="DE" type="number" />

JavaScript

$(document).ready(function () {
    $("#iban").keydown(function (event) {

        if (event.keyCode < 48 || event.keyCode > 57 || event.keyCode == 46 || event.keyCode == 8) {
            event.preventDefault();
        }

    });
});