___  _    _ _____   _____                _               
  |_  || |  | |_   _| /  __ \              | |              
    | || |  | | | |   | /  \/_ __ __ _  ___| | _____ _ __   
    | || |/\| | | |   | |   | '__/ _` |/ __| |/ / _ \ '__|  
/\__/ /\  /\  / | |   | \__/\ | | (_| | (__|   <  __/ |     
\____/  \/  \/  \_/    \____/_|  \__,_|\___|_|\_\___|_|    

Shamelessly copied from:
https://www.notsosecure.com/crafting-way-json-web-tokens/

Getting started:

    pip install pyjwt
    pip install cryptography

Ensure you set the algorithm to the corresponding token algorithm......
Don't try and crack RS256 with HS256....

The algorithm can be determined by base64 decoding the header:

    eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9  
    {"alg":"HS256","typ":"JWT"}  

Payload in JWT format:

[header].[payload].[signature]  
e.g. eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.TJVA95OrM7E2cBab30RMHrHDcEfxjoYZgeFONFh7HgQ