Parse CSV with objects and arrays

[kadimulam]

I am having an issue when i parse a CSV file as shown below.

Original JSON:

{
"firstName": "John",
"lastName": "Smith",
"age": 25,
"address":
{
"streetAddress": "21 2nd Street",
"city": "New York",
"state": "NY",
"postalCode": "10021"
},
"phoneNumber":
[
{
"type": "home",
"number": "212 555-1234"
},
{
"type": "fax",
"number": "646 555-4567"
}
]
}

When i use one of the tool online, it converts the above JSON to the below.
firstName,lastName,age,address/streetAddress,address/city,address/state,address/postalCode,phoneNumber/0/type,phoneNumber/0/number,phoneNumber/1/type,phoneNumber/1/number
John,Smith,25,25 2nd Street,New York,NY,10021,home,212 555-1234,fax,646 555-4567

I am trying to convert the above CSV file back to JSON with your tool and i am expecting the output as shown above, but it is different and converting each column header as a element in JSON.

If i want to convert a CSV file to above JSON format how should i provide the CSV to your tool? Basically my JSON can have Arrays, objects and it will be huge. Could you please advise?