JSFiddle - React, Tailwind, and code Playground

HTML

<div id="msg">
    
    
</div>

<form method="post" action="save3.php">
 <div name="forms" id="form1" class="clonedInput" >
     <label></label><textarea rows="4" cols="50" id="text1" class="text" name="text[]"      ></textarea>
     <label></label><input type="text" id="title1" class="title" name="title[]" />
 </div>
 </form>

<button id="addButton">clone</button>

JavaScript

$(document).ready(function() {

$('#addButton').click(function() {
    
var num = $('.clonedInput').length;
var newNum = new Number(num + 1);

var newElem = $('#form1').clone().attr('id', 'form' + newNum);
newElem.children(':first').attr('id', 'name' + newNum).attr('name', 'name');

$('#form' + num).after(newElem);
$('#form' + newNum + ' textarea').attr('id','texta' + newNum);
$('#form' + newNum + ' input[type="text"]').attr('id','title' + newNum);
$(newElem).append(
   $(document.createElement('input')).attr({
       id:    'myCheckbox'  + newNum
      ,name:  'myCheckbox' + newNum
      ,value: 'myValue'
      ,type:  'checkbox'
      })
   );
 });
    
})