javascript-to-json

js2json.rb

#!/usr/bin/env ruby

# Syntax: js2json.rb [PATHNAME]
#
# This ruby script can be used to evaluate a single javascript
# expression (possibly including comments, arithmetic operators, etc.)
# and print the result as a JSON string.  This is useful for reading
# JSON-with-comments and javascript-style objects.
#
# The script will read from STDIN if no PATHNAME is specified.
# The output can be converted to JSON using "jq fromjson", as shown in the last example.
#
# Examples:
# Input: /* hello */ [1,1+1]
# Output: "[1,2]"

# Input: {a:1} // a comment
# Output: "{\"a\":1}"
#
# Example using "js2json.rb | jq -c fromjson"
# Input: {a: [1,2]}
# Output: {"a":[1,2]}

require 'json'
require 'execjs'

  line=ARGF.read
  x = ExecJS.eval( line )
  case x
    when Array, Hash
      p JSON.generate(x)
    else
      p x.to_json
  end