How to change serializeArray to normal object

I using serializeArray to get all element and I am getting object like

[{name: "code[1][barcode]", value: "45534"},
{name: "code[1][rf_id]", value: "535353"},
{name: "code[1][serialize]", value: ""},
{name: "code[2][barcode]", value: "45534"},
{name: "code[2][rf_id]", value: "535353"},
{name: "code[2][serialize]", value: ""},
{name: "custodian[]", value: "3"},
{name: "custodian[]", value: "4"},
{name: "custodian[]", value: "5"}]

And I want to convert it like this

{
    code:[
            {barcode:"45534",rf_id:"535353",serialize:""},
            {barcode:"45534",rf_id:"535353",serialize:""}
        ],
    custodian: [3,4,5]
}

Currently I am using this script

var x = $('form#acquiredetail').serializeArray();
console.log(x);
var formData = {};
$.each(x, function(i, field){
    if(field.value.trim() != ""){
      formData[field.name] = field.value;
    }
});

And getting output as

Although I am able to get value of code properly but in backend/Laravel but the problem is with custodian, I am getting last value,

custodian[]:"5"

How can I fix this. Or any better solution for this ?

My goal is to pass all element value to php with short and common code. Please suggest if any alternative of this.

Run the code snippet and enjoy :)

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script>
var x = 
[{name: "code[1][barcode]", value: "45534"},
{name: "code[1][rf_id]", value: "535353"},
{name: "code[1][serialize]", value: ""},
{name: "code[2][barcode]", value: "45534"},
{name: "code[2][rf_id]", value: "535353"},
{name: "code[2][serialize]", value: ""},
{name: "custodian[]", value: "3"},
{name: "custodian[]", value: "4"},
{name: "custodian[]", value: "5"}];

   var formData = {};
    $.each(x, function(i, field){
    	if(field.value.trim() != ""){
    		if(formData[field.name] != undefined){
    			var val = formData[field.name];
    			if(!Array.isArray(val)){
    				 arr = [val];
    			}
    			arr.push(field.value.trim());
    			formData[field.name] = arr;
    		}else{
    		  formData[field.name] = field.value;
    		}
        }
    });
    console.log(formData );
    </script>