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Simplest way to expose a JSON service in ASP.NET / DotNetNuke
<%@ ServiceHost
 Service="MyNamespace.MyService"
 Factory="System.ServiceModel.Activation.WebServiceHostFactory" %>

public class MyService : IMyService
{
        public string Test(string text)
        {
            return text; // whatever
        }

}

[ServiceContractAttribute(Namespace="http://schemas.myservice.com")]
public interface IMyService
{
    [OperationContractAttribute]
    [WebInvokeAttribute(UriTemplate="Test", // change this accordingly
     ResponseFormat=WebMessageFormat.Json, // change this accordingly
     RequestFormat=WebMessageFormat.Json, // change this accordingly
     BodyStyle=Wrapped)]
    string Test(string text);
}