Not able to conver json to dataset, datatable - json

Question

I am writing a small tool to convert json to csv. First I try to convert json to Dataset or Datatable but failing.
The Json string is:
{
"id1": {
"id": "id11",
"cards": {
"1": {
"id": "test11",
"fingerprint": "test11",
"last4": "test11",
"exp_month": 7,
"exp_year": 2019,
"brand": "test11"
},
"0": {
"id": "test12",
"fingerprint": "test12",
"last4": "test12",
"exp_month": 7,
"exp_year": 2020,
"brand": "Visa"
},
"2": {
"id": "test13",
"fingerprint": "test13",
"last4": "test13",
"exp_month": 8,
"exp_year": 2020,
"brand": "Visa"
}
}
},
"id2": {
"id": "id21",
"cards": {
"1": {
"id": "test21",
"fingerprint": "test21",
"last4": "test21",
"exp_month": 7,
"exp_year": 2019,
"brand": "MC"
},
"0": {
"id": "test22",
"fingerprint": "test22",
"last4": "test5",
"exp_month": 2,
"exp_year": 2020,
"brand": "Visa"
}
}
}
}
I tried
DataSet ds = JObject.Parse(jsonContent)["root"].ToObject<DataSet>();
DataTable dt = JsonConvert.DeserializeObject<DataTable>(jsonContent);
But it does not work. Gives this error with first one:
An unhandled exception of type 'System.NullReferenceException' occurred in JsonToCsv.exe
Additional information: Object reference not set to an instance of an object.
This error with second one:
An unhandled exception of type 'Newtonsoft.Json.JsonSerializationException' occurred in Newtonsoft.Json.dll
Additional information: Unexpected JSON token when reading DataTable. Expected StartArray, got StartObject. Path '', line 1, position 1.
Any suggestion would be appreciated

Answer 1

I managed to parse json into a list and then converted list to csv. the code to parse json to list is as follows:
public class Card
{
public string ActId { get; set; }
public string CustId { get; set; }
public string Id { get; set; }
public string Fingerprint { get; set; }
public string Last4 { get; set; }
public int Exp_month { get; set; }
public int Exp_year { get; set; }
public string Brand { get; set; }
}
public static List<Card> JsonToCSV(string JsonContent)
{
var ds = JObject.Parse(JsonContent);
var cards = new List<Card>();
foreach (var item in ds)
{
var crds= JObject.Parse(JsonConvert.DeserializeObject(item.Value["cards"].ToString()).ToString());
foreach (var crd in crds)
{
var card =JsonConvert.DeserializeObject<Card>(crd.Value.ToString());
card.ActId= item.Key;
card.CustId= item.Value["id"].ToString();
cards.Add(card);
}
}
return cards;
}