Case classes are (de)serialized as JSON objects:

      import ba.sake.tupson.{given, *}

      case class Address(street: String) derives JsonRW
      case class Person(name: String, age: Int, address: Address) derives JsonRW

      val person = Person("Meho", 33, Address("Sebilj"))
      
      println(person.toJson)
      // { "age":33, "name":"Meho", "address": { "street":"Sebilj" } }