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 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='?',

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type=argparse.FileType(encoding="utf-8"),

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

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default=sys.stdin)

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parser.add_argument('outfile', nargs='?',

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type=argparse.FileType('w', encoding="utf-8"),

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

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default=sys.stdout)

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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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parser.add_argument('--json-lines', action='store_true', default=False,

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help='parse input using the jsonlines format')

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options = parser.parse_args()

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infile = options.infile

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outfile = options.outfile

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sort_keys = options.sort_keys

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json_lines = options.json_lines

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with infile, outfile:

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try:

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if json_lines:

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objs = (json.loads(line) for line in infile)

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else:

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objs = (json.load(infile), )

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for obj in objs:

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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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except ValueError as e:

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raise SystemExit(e)

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if __name__ == '__main__':

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try:

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main()

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except BrokenPipeError as exc:

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sys.exit(exc.errno)

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