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kotlinlang

Also here <https://www.http4k.org/ecosystem/http4k/reference/json/> i read "We have found KotlinSerialisation is possibly the least friendly to use in the context of http4k" -- I'm using it everywhere (db row mapper, JSON in and out) so far and seems to be holding out well. May I ask what is better in other solutions? Or how did kotXser hurt?

It works fine.  It just requires you to register custom adapters the Kotlinx way, and not with http4k's `AutoMappingConfiguration` .  If you use `values4k` classes, you have to build your own adapters rather then use the builtin adapters.