.net framework 4.7.2 json settings

Question

I'm trying to configure my website so every json is serialized in camelCase, which is not the case right now.

I've read several posts in which everyone suggests that I need to configure the Global.asax file, and so far I've tried several ways and none of them where succesful:

protected void Application_Start()
    {
         JsonConvert.DefaultSettings = () =>
        {
            var settings = new JsonSerializerSettings();
            settings.ContractResolver = new CamelCasePropertyNamesContractResolver();
            return settings;
        };

        AreaRegistration.RegisterAllAreas();
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);
    }

protected void Application_Start()
    {

        GlobalConfiguration.Configuration
                            .Formatters
                            .JsonFormatter
                            .SerializerSettings
                            .ContractResolver = new CamelCasePropertyNamesContractResolver();


        AreaRegistration.RegisterAllAreas();
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);
    }


protected void Application_Start()
    {
        HttpConfiguration config = GlobalConfiguration.Configuration;
        config.Formatters.JsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
        config.Formatters.JsonFormatter.UseDataContractJsonSerializer = false;

        AreaRegistration.RegisterAllAreas();
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);
    }

protected void Application_Start()
    {

        var jsonSerializer = Newtonsoft.Json.JsonSerializer.Create(new JsonSerializerSettings
        {
            ContractResolver = new CamelCasePropertyNamesContractResolver()
        });


        AreaRegistration.RegisterAllAreas();
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);
    }

I'm pretty sure I'm doing something wrong, I just don't know what it is.

I don't really need to do this application wise, configuring the specific controller would also work.

Some information about the proyect: this is a MVC5 application, running in .net framework 4.7.2

Thanks a lot!