Sure, you can just use `js.Dynamic`, or write `trait`s describing the "schema" of your JSON, and of you go. Let's say you have have an array of Persons with a name and age, you can type it as:

    @ScalaJSDefined
    trait Person extends js.Object {
      var name: String
      var age: Int
    }

    type Persons = js.Array[Person]

Done deal. With the new option `-P:scalajs:sjsDefinedByDefault` of this release, you don't even need the `@ScalaJSDefined`.