spray json implicit UUID conversion

It probably should've been resolved, however, I ran into the same issue lately (While using akka-http v10.0.0) and I was able to resolve it by defining the following

  implicit object UUIDFormat extends JsonFormat[UUID] {
    def write(uuid: UUID) = JsString(uuid.toString)
    def read(value: JsValue) = {
      value match {
        case JsString(uuid) => UUID.fromString(uuid)
        case _              => throw new DeserializationException("Expected hexadecimal UUID string")
      }
    }
  }

The solution was borrowed from Fidesmo API.

Update:

I added a library that go through the most common use cases. <Link here>