public class Model
{
        public int WeekID { get; set; }
}

[HttpPost]
public IHttpActionResult AddHour(Hour hour)
{
     return Ok();
}

export const SaveWeek s= weekData=> {
  const headers = new Headers();
  headers.append("Content-Type", "application/json");

  const Week= {
    method: "POST",
    headers,
    mode: "cors",
    body: weekData
  };

  console.log("Hours:");

  // Returns {"WeekID": 1}
  console.log(Hours.body);

  return axios.post("http://localhost:52350/api/REST/AddHour", {
    Week
  });
};

[HttpPost]
 public IHttpActionResult AddHour(Hour hour)
 {
   // This returns a string in which the data that I sent
   // can be found.
    string body = Request.Content.ReadAsStringAsync().Result;

     return Ok();
 }