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kotlinlang

kotlinx.serialization.SerializationException: Serializer for class 'UUID' is not found.

`Mark the class as @Serializable or provide the serializer explicitly.`

I know UUID is not serializable.
How do I do provide a serializer in Ktor?

You should create a custom serializer for UUID

How exactly? Can you point me to some resource please?

<https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/serializers.md#custom-serializers>

But how do I annotate a class not defined in my source code, but in an external library?

just follow the guide. You don't have to annotate the class by using your custom serializer