Script for printing JWT token's payload

jwt_decode.py

import argparse
import base64
import json
import typing
from datetime import datetime


def parse_jwt_token(token_part: str) -> dict[str, typing.Any]:
    token_part_with_padding = f"{token_part}{'=' * (len(token_part) % 4)}"

    return json.loads(base64.b64decode(token_part_with_padding))


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument('token', help='JWT token to parse')
    args = parser.parse_args()

    header, payload, _ = args.token.split(".")

    header_data = parse_jwt_token(header)
    token_data = parse_jwt_token(payload)

    print(f"Token Header: {header_data}")
    print(f"Token Data: {token_data}")

    if 'exp' in token_data:
        print(f"Expiration Time: {datetime.fromtimestamp(token_data['exp'])}")
    else:
        print("Expiration Time: Not available")