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

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Usage::

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

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{

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"json": "obj"

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}

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$ echo '{ 1.2:3.4}' | python -m json.tool

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Expecting property name enclosed in double quotes: line 1 column 3 (char 2)

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"""

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import argparse

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import collections

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import json

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import sys

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def main():

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prog = 'python -m json.tool'

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description = ('A simple command line interface for json module '

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'to validate and pretty-print JSON objects.')

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parser = argparse.ArgumentParser(prog=prog, description=description)

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parser.add_argument('infile', nargs='?', type=argparse.FileType(),

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help='a JSON file to be validated or pretty-printed')

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parser.add_argument('outfile', nargs='?', type=argparse.FileType('w'),

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help='write the output of infile to outfile')

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parser.add_argument('--sort-keys', action='store_true', default=False,

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help='sort the output of dictionaries alphabetically by key')

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options = parser.parse_args()

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infile = options.infile or sys.stdin

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outfile = options.outfile or sys.stdout

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sort_keys = options.sort_keys

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with infile:

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try:

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if sort_keys:

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obj = json.load(infile)

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else:

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obj = json.load(infile,

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object_pairs_hook=collections.OrderedDict)

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except ValueError as e:

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raise SystemExit(e)

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with outfile:

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

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outfile.write('\n')

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if __name__ == '__main__':

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main()

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