JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="keywords">Hello
World</textarea>
<input id="data" type="button" value="submit">

JavaScript

(function($){
     $(document).ready(function(){
        $('#data').click(function(e){
           e.preventDefault();
           var ks = $('#keywords').val().split("\n");
           //alert(ks[0]);
            
           $.each(ks, function(k){
              alert(ks[k]);
           });
        });
     });
  })(jQuery);