Snippet from WebApiConfig.cs which shows how to setup the CamelCasePropertyName Json formatter

snippet of WebApiConfig.cs

 GlobalConfiguration.Configuration.Formatters.Remove(config.Formatters.XmlFormatter);

var jsonFormatter = GlobalConfiguration.Configuration.Formatters.JsonFormatter;
jsonFormatter.UseDataContractJsonSerializer = false;
jsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();

GlobalConfiguration.Configuration.Formatters.Add(jsonFormatter);