How to add key/value pair to existing form data

• Add key/value pair to existing form data

  <script> 
  var id = $('#recordID').val();
  formData.append('id', id);
  //Code snippet with form data
  
  $('#form').on('submit', function(e){
      e.preventDefault();
      var formData = new FormData($(this)[0]);
      var id = $('#recordID').val();
      formData.append('id', id);
  
      $.ajax({
          type: "POST",
          dataType: "json",
          url: "/add-record",
          data: formData,
          processData: false,
          success: function(data){
              console.log(data);
          }
      }); 
  })
  </script>
  

  You have to use formData.append('id', id); to add a new key/value pair to existing form data.

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