This example was inspired by "Serialization is Lossy" http://kellabyte.com/2013/05/02/serialization-is-lossy/

LosslessJson.csx

using ImpromptuInterface;
using Newtonsoft.Json.Linq;

/* 
 * This example was inspired by
 * "Serialization is Lossy"
 * http://kellabyte.com/2013/05/02/serialization-is-lossy/
 */


/* helper code combining json.net and impromptu-interface 
   note: there maybe better json.net methods for this. */
public static class LosslessJson{

  public static TInterface Deserialize<TInterface>(string json)
	   where TInterface : class {
			return JObject.Parse(json).ActLike<TInterface>();
	}

	public static string Serialize(object jinterface){
			return Impromptu.UndoActLike(jinterface).ToString();
	}

}

/* Static model of data as interfaces */
public interface ICompany
{
    int Id { get; set; }
    string Name { get; set; }
    IList<IEmployee> Employees { get; } 
}
 
public interface IEmployee
{
    int Id { get; set; }
    string Name { get; set; }
    [Alias("Work Phone")]
    string WorkPhone{ get; set; }
}


/* and  action */
var origJson = @"
        {
            Id: 1,
            Name:'Test Inc.',
            Location:'Somewhere',
            Employees: [
                { Id:1, EmployerId:39421, Name:'Joe' , 
                  'Work Phone' : '555-0125',
                  'Cell Phone' : '555-2222',
                },
                { Id:2, EmployerId:39421, Name:'Jane',
                  'Work Phone' : '555-3210',
                  'Cell Phone' : '555-4444',
                },
            ]
        }
    ";

ICompany company = LosslessJson.Deserialize<ICompany>(origJson);

company.Employees[0].WorkPhone = "555-0123";
company.Employees[1].Name = "Janet";

Console.WriteLine(LosslessJson.Serialize(company));

/* Output retains data that static model was unaware of: */
// {
//   "Id": 1,
//   "Name": "Test Inc.",
//   "Location": "Somewhere",
//   "Employees": [
//     {
//       "Id": 1,
//       "EmployerId": 39421,
//       "Name": "Joe",
//       "Work Phone": "555-0123",
//       "Cell Phone": "555-2222"
//     },
//     {
//       "Id": 2,
//       "EmployerId": 39421,
//       "Name": "Janet",
//       "Work Phone": "555-3210",
//       "Cell Phone": "555-4444"
//     }
//   ]
// }

packages.config

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="ImpromptuInterface" version="6.2.2" targetFramework="net40" />
  <package id="Newtonsoft.Json" version="5.0.5" targetFramework="net45" />
</packages>