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JSFiddle - React, Tailwind, and code Playground

HTML

<input type="hidden" class="code" barcode="567" total_quantity="3" name="product1" value="Nokia rita" id="product-10105">
<input type="hidden" class="code" barcode="567" total_quantity="3" name="product1" value="Nokia rita" id="product-10105">
<input type="hidden" class="code" barcode="567" total_quantity="3" name="product1" value="Nokia rita" id="product-10105">
<input type="hidden" class="code" barcode="200" total_quantity="3" name="product1" value="book" id="product-200">

JavaScript

function getCount(barcode){
  var code = document.getElementsByClassName('code') ;
  var length = code.length ;
  var count = 0 ;
    for(var i = 0 ; i < length ; i++){
      if(code[i].attributes['barcode'].value == barcode) count++ ;
  }
  return count ;
}

// Test

alert(getCount(567)) ; // 3
alert(getCount(200)) ; // 1

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