validate json

validjson.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# author: kyle isom <[email protected]>
# license: isc / public domain dual-license
#
# i have this saved to ~/bin/validjson
"""
Quickly check whether a JSON file is valid or not.
"""

import simplejson
import sys


def valid_json(filename):
    """Determine if a file contains valid JSON."""
    error = None

    try:
        data = open(filename).read()
    except IOError as io_error:
        error = str(io_error)
    else:
        try:
            simplejson.loads(data)
        except simplejson.decoder.JSONDecodeError as json_error:
            error = str(json_error)

    return error


def check_file(filename):
    """Calls valid_json and displays the results."""
    error = valid_json(filename)

    if error:
        print '%s invalid (%s)' % (filename, error)
    else:
        print '%s valid' % (filename, )


def main(filelist):
    """Validate a list of filenames."""
    for filename in filelist:
        check_file(filename)


if '__main__' == __name__:
    if not len(sys.argv) > 1:
        exit(0)
    else:
        main(sys.argv[1:])