JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="pasteIt" placeholder="Paste something here">

JavaScript

$(document).on('paste', '#pasteIt', function () {
    setTimeout(function () {
        alert($("#pasteIt").val());
        var withoutSpaces = $("#pasteIt").val();
        withoutSpaces = withoutSpaces.replace(/\s+/g, '');
        $("#pasteIt").text(withoutSpaces);
    }, 1);
});