config.scala

case class Data(v: String, k: String)
case class DataMap(map: Map[String, Data])

val cfg = """
             |example {
             |  map {
             |    "1" : {
             |       v: "v"
             |       k: "k"
             |       }
             |    "2" : {
             |       v: "v1"
             |       k: "k1"
             |    }
             |  }
             |  keyPrefixLength : 12
             |}
              """.stripMargin

  import pureconfig._
  import pureconfig.generic.auto._

  val myConfig = ConfigFactory.parseString(cfg)
  val read     = loadConfig[DataMap](myConfig, "example")