How Do I Pass Json Object From Fiddler To Webapi2

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C#5.0

fiddler post

http://localhost:15641/api/Complaints/NewComplaints
<pre lang="vb">User-Agent: Fiddler
Content-Type: application/json
Host: localhost:15641
Content-Length: 63</pre>

RequestBody

{
"CostCentre": "test"
"ComplaintText":"this is test complaint"
}

WebApi Controller

[Route("api/Complaints/NewComplaints")]

        [HttpPost]
        public void CreateNewComplaint(BLL.Complaint complaint)
        {
            //call BLL Create complaint method
        }


      }

my object is with null values
where am i doing wrong ?
i put breakpoints on controller the complaint object is set with all null values
if i don't pass the values complaint object it self is null
how can i pass the object