jsonundefined.py

# monkey patch the python json module to handle undefined

import json

json.decoder._CONSTANTS['undefined'] = None
json.scanner.pattern('(-?Infinity|NaN|true|false|null|undefined)')(json.decoder.JSONConstant)
json.decoder.JSONScanner = json.decoder.Scanner(json.decoder.ANYTHING)

if __name__ == '__main__':
    print json.loads('{ "foo": 1, "bar": undefined }')