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simple Python script to deal with Flask session cookie

Project description

Flask Session Cookie Decoder/Encoder

Original author : Wilson Sumanang

Fixes and improvements author : Alexandre ZANNI

Imported from




Python 3

# pacman -S python
# pacman -S python-itsdangerous python-flask --asdep

Python 2

# pacman -S python2
# pacman -S python2-itsdangerous python2-flask --asdep

Other distros

Find your way with your package manager, use pip in a virtual environment or use pyenv.


Use with Python 3 and with Python 2.

usage: flask_session_cookie_manager{2,3}.py [-h] {encode,decode} ...

Flask Session Cookie Decoder/Encoder

positional arguments:
  {encode,decode}  sub-command help
    encode         encode
    decode         decode

optional arguments:
  -h, --help       show this help message and exit


usage: flask_session_cookie_manager{2,3}.py encode [-h] -s <string> -t <string>

optional arguments:
  -h, --help            show this help message and exit
  -s <string>, --secret-key <string>
                        Secret key
  -t <string>, --cookie-structure <string>
                        Session cookie structure


usage: decode [-h] [-s <string>] -c <string>

optional arguments:
  -h, --help            show this help message and exit
  -s <string>, --secret-key <string>
                        Secret key
  -c <string>, --cookie-value <string>
                        Session cookie value



$ python{2,3} flask_session_cookie_manager{2,3}.py encode -s '.{y]tR&sp&77RdO~u3@XAh#TalD@Oh~yOF_51H(QV};K|ghT^d' -t '{"number":"326410031505","username":"admin"}'

Note: the session cookie structure must be a valid python dictionary


With secret key:

$ python{2,3} flask_session_cookie_manager{2,3}.py decode -c 'eyJudW1iZXIiOnsiIGIiOiJNekkyTkRFd01ETXhOVEExIn0sInVzZXJuYW1lIjp7IiBiIjoiWVdSdGFXND0ifX0.DE2iRA.ig5KSlnmsDH4uhDpmsFRPupB5Vw' -s '.{y]tR&sp&77RdO~u3@XAh#TalD@Oh~yOF_51H(QV};K|ghT^d'
{u'username': 'admin', u'number': '326410031505'}

Without secret key (less pretty output):

$ python{2,3} flask_session_cookie_manager{2,3}.py decode -c 'eyJudW1iZXIiOnsiIGIiOiJNekkyTkRFd01ETXhOVEExIn0sInVzZXJuYW1lIjp7IiBiIjoiWVdSdGFXND0ifX0.DE2iRA.ig5KSlnmsDH4uhDpmsFRPupB5Vw'
{"number":{" b":"MzI2NDEwMDMxNTA1"},"username":{" b":"YWRtaW4="}}

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