How should I specify the type of JSON-like unstructured data in Scala?

You're spot on that you want some sort of case classes to model your datatypes. In functional languages these sorts of things are called "Abstract Data Types", and you can read all about how Haskell uses them by Googling around a bit. Scala's equivalent of Haskell's ADTs uses sealed traits and case classes.

Well, there are a couple ways to approach this. I would probably just use MapString, Any, which should work just fine for your purposes (as long as the map is from collection. Immutable rather than collection.

Mutable). However, if you really want to go through some pain, it is possible to give a type for this.

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