1 r"""Command-line tool to validate and pretty-print JSON

     2 

     3 Usage::

     4 

     5     $ echo '{"json":"obj"}' | python -mjson.tool

     6     {

     7         "json": "obj"

     8     }

     9     $ echo '{ 1.2:3.4}' | python -mjson.tool

    10     Expecting property name: line 1 column 2 (char 2)

    11 

    12 """

    13 import sys

    14 import json

    15 

    16 def main():

    17     if len(sys.argv) == 1:

    18         infile = sys.stdin

    19         outfile = sys.stdout

    20     elif len(sys.argv) == 2:

    21         infile = open(sys.argv[1], 'rb')

    22         outfile = sys.stdout

    23     elif len(sys.argv) == 3:

    24         infile = open(sys.argv[1], 'rb')

    25         outfile = open(sys.argv[2], 'wb')

    26     else:

    27         raise SystemExit("{0} [infile [outfile]]".format(sys.argv[0]))

    28     try:

    29         obj = json.load(infile)

    30     except ValueError, e:

    31         raise SystemExit(e)

    32     json.dump(obj, outfile, sort_keys=True, indent=4)

    33     outfile.write('\n')

    34 

    35 

    36 if __name__ == '__main__':

    37     main()