gistfile1.scala

class Test {
 case class User(name: String, age: Int)

 implicit val formats = Json.formats
 implicit val validate: Validate[User] = Validate[User]()
 implicit val read: Read.Json[User] = Read.reflect[User]
 
 val json = Json.parseJObject(
      s"""
         |{
         | "body": [
         |   {"name": "N1", "age": 1},
         |   {"name": "N2", "age": 2}
         | ]
         |}
       """.stripMargin
      )
 println(Read.fromJArray[User]((json \ "body").to[JArray].getOrThrow))

}

Output: Failure(ArrayBuffer(FieldError(field-missing,The field is missing.,Field(List([0], $outer)))))