Converting XML to JSON skipping root element

I have to convert xml to JSON.I have implemented in below way

XMLSerializer xmlSerializer = new XMLSerializer();
//xmlSerializer.setForceTopLevelObject(true);
//Above line is comented since i want to skip xml root element
JSON json = xmlSerializer.read(inputXml);
outJSON = json.toString(2);

My input xml is

<details>
    <name>
        <firstName>sir</firstName>
        <lastName>John</lastName>
        <midddleName>Nash</midddleName>
    </name>
    <address>24525 ross street</address>
</details>

My output JSON is which is coming fine skipping root the element

{
  "name":   {
    "firstName": "sir",
    "lastName": "John",
    "midddleName": "Nash"
  },
  "address": "24525 ross street"
}

But when i gave request as

<details>
    <name>
        <firstName>sir</firstName>
        <lastName>John</lastName>
        <midddleName>Nash</midddleName>
    </name>
</details>

My JSON response is

[
  {
    "firstName": "sir",
    "lastName": "John",
    "midddleName": "Nash"
  }
]

But i need response as

{ "name": { "firstName": "sir", "lastName": "John", "midddleName": "Nash" } }

Please suggest me even if there any other API to provide this functionality

Any help would be appreciated.

Thanks