Given a `kotlinx.serialization.json.Json` object. ...

# serialization

[spand]

Given a kotlinx.serialization.json.Json object. Can I ask it if it is configured to serialize a given KClass or if it will throw an exception when encountering instances of that type ?

[Vsevolod Tolstopyatov [JB]]

Do you know whether KClass is marked with @Serializable? What platform is it?

On JVM, you can check if class has @Serializable annotation via reflection or if Json.serializersModule.getContextual(KClass) != null

On multiplatform you’ll need an actual T for that. Then you can use something like Json.serializersModule.serializer<T>() to see if that returns a value or throws

[spand]

I am on the JVM. I wanted to check if a type was serializable so I could get close to the compile time guarantees of @Serializable but runtime checked (in a test) when using external serializers ( @Serializer(forClass = ...) ). It is shelved for now but I guess module.serializer<T>() is the way to go.