JWTManager object has no attribute token_in_blacklist_loader

If you're using this error:

AttributeError: 'JWTManager' object has no attribute 'token_in_blacklist_loader'

it because you're using flask-jwt-extended version 4 and alot changed in version 4 you can see here. the token_in_blacklist_loader changed to token_in_blocklist_loader

how to overcome this issue

the recent migration to flask-jwt-extended made alot of improving and the following function now takes two arguments (jwt_header, jwt_payload):

@jwt.needs_fresh_token_loader
@jwt.revoked_token_loader
@jwt.user_lookup_loader
@jwt.user_lookup_error_loader
@jwt.expired_token_loader
@jwt.token_in_blocklist_loader
@jwt.token_verification_loader
@jwt.token_verification_failed_loader

now you can fix the error and the jti is exist in jwt-payload:

@jwt.token_in_blocklist_loader
def check_if_token_in_blacklist(jwt_header, jwt_payload):
    jti = jwt_payload['jti']
    token_in_redis = jwt_redis_blacklist.get(jti)
    return token_in_redis is not False

Thank you so much for reading! If you still see any issue, let me know!