FAQ's

Error: Unsupported grant_type

Check if you're enabling the desired grant type on the AuthorizationServer. See https://tsoauth2server.com/docs/authorization_server/#enabling-grant-types for more.

import {AuthorizationServer} from "@jmondi/oauth2-server";

const authorizationServer = new AuthorizationServer(...);
authorizationServer.enableGrantType({ grant: "password" ... });

Error: Client has been revoked or is invalid

Check the OAuthClientRepository#isClientValid method, it is returning false.