JarCastingspy 
Library for Scala 2.13+ projects for pretty printing case classes with field names in hierarchical tree format. Useful for debugging purposes as it gives human readable representation of case classes. Provides .spy extension method for any object.
User guide
Works only with Scala 2.13+
libraryDependencies += "com.gu" %% "spy" % "x.x.x"
Example
import com.gu.spy._
case class Address(street: String, city: String, planet: String, country: String)
case class User(name: String, age: Int, address: Address)
val user = User("Jean-Luc Picard", 79, Address("Starfleet", "San Francisco", "Earth", "United Federation of Planets"))
println(user.spy)
where println(user.spy) outputs
User
name: Jean-Luc Picard
age: 79
address: Address
street: Starfleet
city: San Francisco
planet: Earth
country: United Federation of Planets
as opposed to usual println(user) output
User(Jean-Luc Picard,79,Address(Starfleet,San Francisco,Earth,United Federation of Planets))
Credits
- Based on Xavier Guihot's StackOverflow answer.
- Case Class toString new behavior proposal
