Self referencing loop detected for property 'xxxx' with type 'System.Data.Entity.DynamicProxies.XXX_XXX'. Newtonsoft.Json.JsonSerializationException

This is a very common serialization exception we see when forget to use loop handling strategies in Web API.

Look at the below screenshot which you have noticed:

Now if you want to resolve this issue, you can use following code in web api configuration, here's how you can resolve this issue:

var json = config.Formatters.JsonFormatter;

json.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;

Here's the complete code snippet screenshot:

Hope this helps you.