json4s extract and serialize

Json4sExtractSerializeExample.scala

import org.json4s.jackson.JsonMethods._
import org.json4s._
import org.json4s.jackson.Serialization
import org.json4s.jackson.Serialization.write

implicit val formats = Serialization.formats(NoTypeHints)

case class Foo(id: String, bar: Option[Bar])

case class Bar(id: String, foos: Option[Seq[Foo]])

// foo1 contains bar1 which contains foo2
val jsonStr = """{ "id": "foo1", "bar": { "id": "bar1", "foos": [ { "id": "foo2" } ] } }"""
val json = parse(jsonStr)
val foo = json.extract[Foo]

// Did it work?
foo.bar.flatMap(_.foos).flatMap(_.headOption).map(_.id).contains("foo2")

// Complete round trip
write(foo)

https://github.com/json4s/json4s