parameter('tagId.as[UUID].?)

• akka.http.scaladsl.unmarshalling.

  PredefinedFromStringUnmarshallers

• io.circe.Decoder

• de.heikoseeberger.akkahttpcirce.

  FailFastUnmarshaller

implicit def stringUnmarshaller[A: Decoder]: FromStringUnmarshaller[A] = {
  Unmarshaller.strict[String, A] { str =>
    implicitly[Decoder[A]].decodeJson(Json.fromString(str))
      .fold(throw _, identity)
  }
}