Generic derivation for ADTs in Scala with a custom representation
Representing case classes as JSON arrays The first thing to note is that the circe-shapes module provides instances for Shapeless's HLists that use an array representation like the one we want for our case classes. For example: scala> import io.circe.shapes._ import io.circe.shapes._ scala> import shapeless._ import shapeless._ scala> ("foo" :: 1 :: List(true, false) :: HNil).asJson.noSpaces res4:
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