gistfile1.scala

case class Holder(item: List[String])
implicit val HolderFormat: Format[Holder] = wrap[Holder, List[String]]("item")(_.item, Holder)

// instantiate the case class
val n = Holder(List("debasish ghosh", "jonas boner", "stephan schmidt"))

// js is a JsValue
val js = tojson(n)

// convert js to string and print
println(dispatch.json.JsValue.toJson(js))

// de-serailzing using fromjson will give back the Holder n
fromjson[Holder](tojson(n)) should equal(n)