To grow as programmers, it is helpful to look at how people train in other areas, e.g., sports. Most martial arts have a similar notion as Karate's "kata": A simulated fight against imagined enemies, using a set of well known movements to practice and internalize techniques.

This is my programming kata: To write a JSON parser in multiple programming languages, testing against a wide variety of generated test cases.

1. Write a program that takes a valid JSON string as input, parses it into an AST, then prints it as JSON.
2. All content must be preserved on this roundtrip, but not its form (e.g., the order of keys may vary).

A python unit test will be run against each executable. It generates valid JSON data to pass to the executable and measures its runtime performance. All programs will be presented with the same inputs for comparability; generation is random, but based on a fixed seed.

The output of each program will be parsed by the test program to

1. check for presence and identical contents of every key,
2. check validity of the generated JSON