I have a table with some date in it:

        <tr class="unit-table'"> 
          <td><input type="text" name="" id="item"></td>
          <td><input type="text" name="" id="price"></td>
          <td><input type="text" name="" id="qty"></td>
          <td><input type="text" name="" id="disc"></td>
        </tr> 

User can add new rows to this table. I'm using Fetch API to post this data. The response from API am trying to post is looks like this

 "computer_and_infrastructure": [
            {
                "item": "Computer Support",
                "unit_price": 30,
                "qty": 5,
                "discount": 0
            }
        ]

My question is how can I loop through all table data and add it to my request?