JSON Minify — Ruby source

# json-minify — compact JSON to its smallest valid form. Ruby port (canonical
# TS: src/lib/json-minify.ts; Go twin: cli/json-minify). Mirrors the JS/PHP
# ports: parse, then re-emit compact via Ruby's bundled 'json' stdlib.
require 'json'

module JsonMinify
  module_function

  # Compact serialization of input, or nil for invalid JSON — same inputs ->
  # same outputs as the TS / Go references. JSON.generate is compact by
  # default and never escapes '/' or non-ASCII, matching Go json.Compact and
  # JS JSON.stringify. allow_nan: false rejects the non-standard NaN /
  # Infinity tokens that Go's grammar also rejects (the Python port's
  # parse_constant analogue). Hash keeps insertion order, so key order holds.
  def minify(input)
    JSON.generate(JSON.parse(input, allow_nan: false))
  rescue JSON::ParserError, JSON::NestingError
    nil
  end
end

if __FILE__ == $PROGRAM_NAME
  puts JsonMinify.minify("{\n  \"a\": 1,\n  \"b\": [\n    1,\n    2\n  ]\n}") # {"a":1,"b":[1,2]}
  puts JsonMinify.minify('{invalid}').inspect # nil — invalid JSON
end