How to parse a json string to a case class in scaja.js and vice versa

Use one of the pickling libraries that work with Scala.js. The following two produce well-behaved and predictable JSON:

• uPickle
• Prickle

Circe has more than 1000 stars: https://github.com/circe/circe

More safe and efficient options are:

• AVSystems GenCodec
• Borer
• jsoniter-scala

Bellow are results of benchmarks for parsing and serialization of a message sample from the Twitter API: