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case class Resident(name: String, age: Int, role: Option[String])

import play.api.libs.json._

implicit val residentReads = Json.reads[Resident]

import play.api.libs.json._
import play.api.libs.functional.syntax._

implicit val residentReads = (
  (__ \ "name").read[String] and
  (__ \ "age").read[Int] and
  (__ \ "role").readNullable[String]
)(Resident)

import play.api.libs.json._

implicit val residentWrites = Json.writes[Resident]
import play.api.libs.json._

implicit val residentFormat = Json.format[Resident]