spray-json. Remove empty string before deserialising JSON

JsonSpec.scala

import org.scalatest.{Matchers, WordSpec}
import spray.json._

object JsonHelper {

  implicit class JsObjectWrap(obj: JsObject) {

    def removeEmptyValues: JsObject = JsObject(obj.fields
      .map {
        case (key, value: JsObject) => (key, value.removeEmptyValues)
        case nonJsObject => nonJsObject
      }
      .filterNot {
        case (_, value) => isEmptyValue(value)
      }
    )

    private def isEmptyValue(value: JsValue): Boolean =
      value == JsString("") || value == JsObject.empty
  }

}

class JsonSpec extends WordSpec with Matchers {

  import JsonHelper._

  "JsObject" should {

    "drop empty strings" in {
      val json = """{"p1":"","p2":"value","p3":""}""".parseJson.asJsObject
      json.removeEmptyValues shouldEqual """{"p2":"value"}""".parseJson
    }

    "drop empty objects" in {
      val json = """{"p1":"value","p2":{}, "p3":{}}""".parseJson.asJsObject
      json.removeEmptyValues shouldEqual """{"p1":"value"}""".parseJson
    }

    "drop an empty string in a nested object" in {
      val json = """{"p1":{"p2":"value","p3":""}}""".parseJson.asJsObject
      json.removeEmptyValues shouldEqual """{"p1":{"p2":"value"}}""".parseJson
    }

    "drop an object that contains only empty strings" in {
      val json = """{"p1":"value","p2":{"p3":"","p4":""}}""".parseJson.asJsObject
      json.removeEmptyValues shouldEqual """{"p1":"value"}""".parseJson
    }
  }
}