Url encoded query string parser

parse_qs.py

#!/usr/bin/env python
"""
Parses application/x-www-form-urlencoded string into a json.

Usage example:
  ~$ echo "a=1&b=2&a=3" | ./parse_qs.py | jq .
  {
    "a": [
      "1",
      "3"
    ],
    "b": "2"
  }
"""

import json
from urlparse import parse_qs
import sys


if __name__ == "__main__":
    for line in sys.stdin:
        line = line.strip().strip('"').strip("'")

        # flatten single values
        result = {
          k: v[0] if len(v) == 1 else v
          for k, v in parse_qs(line).iteritems()
        }

        # format output for jq
        print json.dumps(result, separators=[',', ':'], indent=None)