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jpayne@68
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1 r"""Command-line tool to validate and pretty-print JSON
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2
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3 Usage::
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4
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5 $ echo '{"json":"obj"}' | python -m json.tool
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6 {
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7 "json": "obj"
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8 }
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9 $ echo '{ 1.2:3.4}' | python -m json.tool
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10 Expecting property name enclosed in double quotes: line 1 column 3 (char 2)
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11
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12 """
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13 import argparse
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14 import json
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15 import sys
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16
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17
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18 def main():
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19 prog = 'python -m json.tool'
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20 description = ('A simple command line interface for json module '
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21 'to validate and pretty-print JSON objects.')
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22 parser = argparse.ArgumentParser(prog=prog, description=description)
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23 parser.add_argument('infile', nargs='?',
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24 type=argparse.FileType(encoding="utf-8"),
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25 help='a JSON file to be validated or pretty-printed',
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26 default=sys.stdin)
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27 parser.add_argument('outfile', nargs='?',
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28 type=argparse.FileType('w', encoding="utf-8"),
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29 help='write the output of infile to outfile',
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30 default=sys.stdout)
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31 parser.add_argument('--sort-keys', action='store_true', default=False,
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32 help='sort the output of dictionaries alphabetically by key')
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33 parser.add_argument('--json-lines', action='store_true', default=False,
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34 help='parse input using the jsonlines format')
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35 options = parser.parse_args()
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36
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37 infile = options.infile
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38 outfile = options.outfile
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39 sort_keys = options.sort_keys
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40 json_lines = options.json_lines
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41 with infile, outfile:
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42 try:
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43 if json_lines:
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44 objs = (json.loads(line) for line in infile)
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45 else:
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46 objs = (json.load(infile), )
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47 for obj in objs:
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48 json.dump(obj, outfile, sort_keys=sort_keys, indent=4)
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49 outfile.write('\n')
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50 except ValueError as e:
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51 raise SystemExit(e)
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52
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53
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54 if __name__ == '__main__':
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55 main()
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