Swashbuckle Pro Tips for ASP.NET Web API #1

WebApiConfig.cs

public static class WebApiConfig
{
    public static void Register(IAppBuilder app)
    {
        ...

        var mediaType = new MediaTypeHeaderValue("application/json");

        var formatter = new JsonMediaTypeFormatter();
        formatter.SupportedMediaTypes.Clear();
        formatter.SupportedMediaTypes.Add(mediaType);

        var config = new HttpConfiguration();
        config.Formatters.Clear();
        config.Formatters.Add(formatter);

        ...
    }
}