using System;

using Newtonsoft.Json.Linq; 

using Newtonsoft.Json;

using System.Data;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var json = JObject.Parse(@"{

       'response': [

        {

          'fieldNameInAPI': 'fieldResp1',

          'fieldPathInAPIResponse': 'response.obj.fieldResp1',

          'fieldNameInCSV': 'column1'

        },

        {

          'fieldNameInAPI': 'fieldResp2',

          'fieldPathInAPIResponse': 'response.obj.fieldResp2',

          'fieldNameInCSV': 'column2'

        }

      ]

     }");

​

        JToken data = json.SelectToken("$.response");

        Console.WriteLine(data);

        var dataTable = (DataTable)JsonConvert.DeserializeObject(json.SelectToken("$.response").ToString(), (typeof(DataTable)));

​

        //Datatable to CSV

        var lines = new List<string>();

        string[] columnNames = dataTable.Columns.Cast<DataColumn>().

            Select(column => column.ColumnName).

            ToArray();

        var header = string.Join(",", columnNames);

        lines.Add(header);

        var valueLines = dataTable.AsEnumerable()

            .Select(row => string.Join(",", row.ItemArray));

        lines.AddRange(valueLines);

        foreach(var line in lines)

        Console.WriteLine(line);

    }

}