My Default Startup Class for OWIN WebAPI apps.

Startup.cs

    /// <summary>
    /// Default Startup Class for OWIN WebAPI apps
    /// </summary>
    /// <remarks>
    /// Requires the following NuGet Packages to be installed:
    ///   - Install-Package Microsoft.AspNet.WebApi.Owin
    ///   - Install-Package Microsoft.AspNet.WebApi.WebHost (If IIS-hosted) 
    /// </remarks>
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            var config = new HttpConfiguration();

            ConfigureRoutes(config);
            ConfigureJson(config);

            app.UseWebApi(config);
        }

        private static void ConfigureRoutes(HttpConfiguration config)
        {
            // I only want Attribute Routing
            config.MapHttpAttributeRoutes();

            // For now, let's turn on all error details.
            config.IncludeErrorDetailPolicy = IncludeErrorDetailPolicy.Always;
        }

        private static void ConfigureJson(HttpConfiguration config)
        {
            var formatters = config.Formatters;
            var jsonFormatter = formatters.JsonFormatter;

            // This lets us get JSON as the default in the browser
            jsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/html"));
            
            // This camelCases our JSON
            var settings = jsonFormatter.SerializerSettings;
            settings.Formatting = Formatting.Indented;
            settings.ContractResolver = new CamelCasePropertyNamesContractResolver();
        }
    }