Semiauto.scala

import io.circe.semiauto._
import io.circe.syntax._

final case class Address(street: String, zipCode: String, city: String)

object Address {
    implicit val addressEcncoder: Encoder[Address] = deriveEncoder[Address]
    implicit val addressDecoder: Decoder[Address] = deriveDecoder[Address]
}

final case class Person(name: String, age: Int, address: Address)

object Person {
   implicit val personEncoder: Encoder[Person] = deriveEncoder[Person]
   implicit val personDecoder: Decoder[Person] = deriveDecoder[Person]
}

val personJson = Person("Alice", 13, Address("Blue", "111", "Wind Gap").asJson