1r"""Command-line tool to validate and pretty-print JSON 2 3Usage:: 4 5 $ echo '{"json":"obj"}' | python -m json.tool 6 { 7 "json": "obj" 8 } 9 $ echo '{ 1.2:3.4}' | python -m json.tool 10 Expecting property name enclosed in double quotes: line 1 column 3 (char 2) 11 12""" 13import sys 14import json 15 16def 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(sys.argv[0] + " [infile [outfile]]") 28 with infile: 29 try: 30 obj = json.load(infile) 31 except ValueError, e: 32 raise SystemExit(e) 33 with outfile: 34 json.dump(obj, outfile, sort_keys=True, 35 indent=4, separators=(',', ': ')) 36 outfile.write('\n') 37 38 39if __name__ == '__main__': 40 main() 41