Could not deserialize key data on decoding JWT python

Question

I am using pyjwt library for decoding the JWT token. I got this error when I am decoding. The code was given in the documantation.

import jwt

encoded_jwt=\'         


        

Answer 1

Use the authlib library, I never managed to decode keycloak tokens with pyjwt. You need a public_key, I assume you have it.

from authlib.jose import jwt
key = '-----BEGIN PUBLIC KEY-----\n' + public_key + '\n-----END PUBLIC KEY-----'
key_binary = key.encode('ascii')

try:
    claims = jwt.decode(encoded,key_binary)
    claims.validate()
    #do some logic here
    #...

ProTip: you may grab the public key easily from your auth server (in my case Keycloak) at some endpoint:

url = 'http://localhost:8080/auth/realms/your_realm'
with  urllib.request.urlopen(url) as r:
    response = r.read()
    public_key = json.loads(response)['public_key']