Simple Scala JSON library for non-recursive case classes -

i have case classes contain strings or collections of strings , want convert them json objects corresponding field names plus additional field denote type.

sealed trait item case class productx(a: string, b: string) extends item case class producty(a: string, b: string) extends item case class collx(els: list[string]) extends item case class colly(els: list[string]) extends item 

most libs have special support case classes there never seems way use in conjunction additional type field disambiguate isomorphic cases, , i'd have fall more low-level descriptions.

so far i've tried spray-json , argonaut , wind way more boilerplate simple usage scenario justify:

// spray-json  implicit object collxjsonformat extends rootjsonformat[collx] {   def write(ss: collx) = jsobject(     "type" -> jsstring("collx"),     "els"  -> jsarray(ss.els.map(jsstring(_)): _*)   )   def read(value: jsvalue) = {     value.asjsobject.getfields("type", "els") match {       case seq(jsstring("collx"), jsarray(els)) =>         collx(els.tolist.map({           case jsstring(s) => s           case _ => throw new deserializationexception("jsstring expected")         }))       case _ => throw new deserializationexception("collx expected")     }   } } 

for argonaut couldn't figure out how match type field since decoderesult has no filter method:

// argonaut  implicit def collxcodec: codecjson[collx] =   codecjson(     (px: collx) =>       ("type" := "collx") ->:       ("els" := px.els) ->:       jemptyobject,     c => {       t <- (c --\ "type").as[string]       els <- (c --\ "els").as[list[string]]     } yield collx(els)) 

is there lib can handle better or there feature in 1 of these libs i've overlooked reduce boilerplate?

i use: net.liftweb results.

you can create json way. example if have:

case class abjsontemplate(a: string, b: string) 

you can create json this:

net.liftweb.json.serialization.write(abjsontemplate("a", "b")) 

in sbt:

librarydependencies += "net.liftweb" %% "lift-json" % "3.0-m1" 

i hope can help.