format_json.py

#!/usr/bin/env python

import argparse
import json
from collections import OrderedDict

def parse_args(args=None):
    parser = argparse.ArgumentParser()
    parser.add_argument('input')
    parser.add_argument('output')

    args = parser.parse_args(args)
    return args

def main(args=None):
    args = parse_args(args)
        
    text = open(args.input).read()
    data = json.loads(text, object_pairs_hook=OrderedDict)
    text = json.dumps(data, indent=4)
    open(args.output, 'wb').write(text)

if __name__ == '__main__':
    main()