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 sys

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import json

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def main():

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if len(sys.argv) == 1:

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infile = sys.stdin

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outfile = sys.stdout

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elif len(sys.argv) == 2:

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

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outfile = sys.stdout

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elif len(sys.argv) == 3:

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

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

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else:

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raise SystemExit(sys.argv[0] + " [infile [outfile]]")

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with infile:

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try:

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obj = json.load(infile)

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except ValueError, e:

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raise SystemExit(e)

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with outfile:

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json.dump(obj, outfile, sort_keys=True,

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indent=4, separators=(',', ': '))

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outfile.write('\n')

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if __name__ == '__main__':

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main()

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