using System;

using System.Collections.Generic;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string req = @"

            {

                'creationRequestId':'A',

                'value':

                {

                    'amount':1.0,

                    'currencyCode':'USD'

                }

            }";

        var token = JToken.Parse(req);

        PrintLeafNames(token);

    }

​

    public static void PrintLeafNames(IEnumerable<JToken> tokens)

    {

        foreach (var token in tokens)

        {

            if (token.Type == JTokenType.Property)

            {

                JProperty prop = (JProperty)token;

                if (!prop.Value.HasValues)

                    Console.WriteLine(prop.Name);

            }

            if (token.HasValues)

                PrintLeafNames(token.Children());

        }

    }

}