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"/>
    <div id="answer"></div>

JavaScript

function countBarcode(numberToFind){
        var countInputs = 0;

        $('input[barcode]').each(function(){
            if($(this).attr("barcode") == numberToFind){
                countInputs ++;
        }
            $('#answer').html(countInputs);
            

    });
    
}
    
    countBarcode(567);