Decodes JWT base64 encoded token without the JWT singing key (Offline)

jwt.py

import base64
import json


def decode(token):
    # Decodes JWT base64 encoded token
    try:
        alg, payload, signature = token.split(".")
        payload += '=' * (-len(payload) % 4)
        decode_payload = json.loads(base64.b64decode(payload).decode("utf-8"))
        if "client_id" in decode_payload.keys():
            return decode_payload
        else:
            return None
    except (Exception, TypeError):
        return None


if __name__ == "__main__":

    print(decode("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJhcHBpbmZvIjp7ImlkIjoicGFydG5lci1hcHAiLCJuYW1lIjoiUGFydG5lciBBcHAifSwiYXVkIjoiaWFtIiwiY2xpZW50X2lkIjoicGFydG5lci1hcHAiLCJjbGllbnRfdHlwZSI6ImFwcCIsImVudiI6Im90ZSIsImV4cCI6NDY2ODc2MzM3NiwiZXhwaXJlcyI6MzE1NTY5MjYwMCwiaWF0IjoxNTEzMDcwNzc2LCJpc3MiOiJpbjppYW06Iiwic2NvcGUiOiJzZGsifQ.awtZSwRj9OJLxz5XSbC_2ALzpv2xViJ74AHbZBhN8Xg"))
    print(decode("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJhcHBpbmZvIjp7ImlkIjoicGFydG5lci1hcHAiLCJuYW1lIjoiUGFydG5lciBBcHAifSwiYXVkIjoiaWFtIiwiY2xpZW50X2lkIjoicGFydG5lci1hcHAiLCJjbGllbnRfdHlwZSI6ImFwcCIsImVudiI6Im90ZSIsImV4cCI6NDY2OTM1OTM3NiwiZXhwaXJlcyI6MzE1NTY5MjYwMCwiaWF0IjoxNTEzNjY2Nzc2LCJpc3MiOiJpbjppYW06Iiwic2NvcGUiOiJtYW5pZmVzdCJ9.g25qSbGuMhVq5Q2Hm2eNzCMlbcM7hXzARqhyb776x_k"))