import play.api.libs.functional.syntax._
import play.api.libs.json.{Format, Reads, Writes, _}

case class Person(name: String) extends AnyVal

object Person {

  implicit val f1: Format[Person] = implicitly[Format[String]].inmap[Person](Person(_), _.name)

  implicit val f2: Format[Person] = Format(__.read[String].map(Person(_)), implicitly[Writes[String]].contramap { case Person(v) => v })

  implicit val r: Reads[Person] = _.validate[String].map(Person(_))
}