Add custom key/value to JWT token payload or user with keycloak

Question

I have keycloak running in localhost. I want to

• add a key/value pair to the token payload
• or add a key/value pair related to the user (payload again)

Can you suggest me a way to do this and a way to verify that it has been added?

(I guess with https://jwt.io/)

Pantheas

A key/value pair ? What do you mean ? You want to add some payload in the claims of the JWT ? Only the keycloak server can add custom payload, if you do it outside, the signature will become invalid. To add custom claims check this keycloak.gitbooks.io/documentation/content/server_admin/topics/… – Thea

Yes, I want to add a key/value pair to the payload of the token, exactly, I am the administrator of the keycloak server so I can do that. – Pantheas

Okay, then the solution is explained in the link of my previous comment. – Thea

I tried to add a key/value pair in the mappers sections as user attribute and user property. When I copy paste the access token in jwt.io to verify its payload, I do not see my custom key/value pairs – Pantheas

Answer 1

As mentioned above by Sébastien, a mapper should be added. So I have added a mapper user attribute and then I went to users->attributes and added the same key name with its value. I verified it afterwards, the key/value pair is included in the payload

Pantheas

The doc link in the comment is dead. Is there a current doc/ article about the solution? – Eyeleen

what if i want to add list of strings in one key – Darkness