JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<form id="form1" method="post" class="form-horizontal" role="form">
  <fieldset>


    <div class="form-group">
      <div class="col-xs-2">
        <input type="text" list="products" class="form-control product" name="product" />
        <datalist id="products" class="products"></datalist>
      </div>

      <div class="col-xs-4">
        <input id="" type="text" class="form-control description" name="description-0" />
      </div>



      <div class="col-xs-1">
        <button type="button" class="btn btn-default addButtonDED"><i class="fa fa-plus"></i></button>
      </div>
    </div>

    <div class="col-xs-10 ">
      <button type="submit" name="formAction" value="next" class="btn btn-primary">sUBMIT</button>

    </div>



  </fieldset>
</form>

JavaScript

var dataList = $('.products');
var jsonOptions = [{
  "product": "11111",
  "description": "description 1"
}, {
  "product": "22222",
  "description": "description 2"
}, {
  "product": "33333",
  "description": "description 3"
}];

jsonOptions.forEach(function(item) {

  var option = '<option value="' + item.product + '">' + item.description + '</option>';

  dataList.append(option);
});

$(function() {
  $('body').on('input', '.product,.products', function() {

    var i = this.value;
    var description = "";
    var productsInBox = 0;

    jsonOptions.forEach(function(a) {
      if (a.product == i) {
        description = a.description;
      }
    });
    $(this).closest('.form-group').find('.description').val(description);


  });
});

counter = 0;

$('#form1').on('click', '.addButtonDED', function() {
    counter++;
    console.log(counter);
    var $template = $('.form-group').eq(0).clone(true, true)
    
    
    .find('input').val('').end()
      .find('.addButtonDED').removeClass('addButtonDED').addClass('removeButtonDED').end()
      .find('[name="description-0"]').prop('name', 'description-' + counter).end()
      .find('i').removeClass('fa-plus').addClass('fa-minus').end();
    $template.insertAfter('.form-group:last');
  })

  // Remove button click handler
  .on('click', '.removeButtonDED', function() {
    counter--;
    var $row = $(this).closest('.form-group');
    $row.remove();
  });