Circe Transform App

CirceTransformApp.scala

package example

import io.circe._
import io.circe.parser._
import io.circe.optics.JsonOptics._
import monocle.function.Plated

object CirceTransformApp {

  def main(args: Array[String]): Unit = {
    val json: Json = parse(
      """
    {
      "Order": {
        "Customer": {
          "Name": "Custy McCustomer",
          "ContactDetails": {
            "Address": "1 Fake Street, London, England",
            "Phone": "0123-456-789"
          }
        },
        "Items": [{
          "Id": 123,
          "Description": "banana",
          "Quantity": 1
        }, {
          "Id": 456,
          "Description": "apple",
          "Quantity": 2
        }],
        "Total": 123.45
      }
    }
    """).getOrElse(Json.Null)

    val result = Plated.transform[Json] { j =>
//      println(j)
//      println()
      j.asObject match {
        case Some(obj) => Json.fromFields(obj.toIterable.map { case (key, value) =>
          val c = key.toCharArray
          c(0) = Character.toLowerCase(c(0))
          new String(c) -> value })
        case None => j
      }
    }(json)

    println(result)
  }
}