The 'ObjectContent`1' type failed to serialize the response body for content type 'application/json

[txbrown]

@mattbrailsford I am opening this issue more as a help to solve this problem with AuthU within my side project. AuthU works fine when I dont have my webapi serializing to json but it does this when I change the default webapi serializer to use json and remove xml.

More specifically, this only occurs when we have the attribute decorator [JsonProperty(NullValueHandling = NullValueHandling.Ignore)] or [JsonIgnore] in OAuthTokenResponse

I have tried following some stackoverflow solutions to similar issues like this but those didnt work for me.

Do you have an idea of what this might be? Thanks!

[mattbrailsford]

Why do you need to change it? Doesn't the default handle both XML and JSON depending on what your accepts header is?

With regards to the specific error though, I could do with more info. What is your code for registering your serializer? What solutions have you tried?

[txbrown]

@mattbrailsford I wanted all my output to be json so I removed it. I'll remove the config for this and use accept header and see what happens.

this is my webapi.config (somehow cant style whole block as code in github...):

public class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        //format api output to json and indent
        config.Formatters.Remove(config.Formatters.XmlFormatter);
        config.Formatters.JsonFormatter.SerializerSettings.Formatting = Formatting.Indented;
        config.Formatters.JsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
    }
}

[txbrown]

I removed my api config and I still get the issue. I guess this is an underlying issue within my app

[mattbrailsford]

And how are you calling WebApiConfig.Register in relation to the AuthU config?

[txbrown]

This is how I have my AppStart:

protected override void ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {
        WebApiConfig.Register(GlobalConfiguration.Configuration);

        OAuth.ConfigureEndpoint("/oauth/token", new OAuthOptions
        {
            UserService = new UmbracoMembersOAuthUserService(),
            SymmetricKey = "856FECBA3B06519C8DDDBC80BB080553",
            AccessTokenLifeTime = 20, // Minutes
            AllowInsecureHttp = true // During development only
        });
    }

[ievgeniistepanenko]

Hi. You can try update Newtonsoft.Json to 9.0.1 for Umbraco project. After change in web.config

bindingRedirect oldVersion="0.0.0.0-9.0.0.0" newVersion="9.0.0.0"

for dependentAssembly "Newtonsoft.Json"

[txbrown]

@mattbrailsford gave another try to the package and followed @ievgeniistepanenko tip - it is now working. thanks! the issue can be closed.

[mattbrailsford]

@codenakama ahhh, of course. Glad you got it working.