JSFiddle - React, Tailwind, and code Playground

HTML

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

JavaScript

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