[keycloak-user] Authenticate a REST API with keycloak in express node js without using adapters

Hello all, I have a REST API in express node js. I want to secure it with keycloak bearer auth only. So, a keycloak token would be recieved in the Authorization header of the GET request to the REST API. I have to verify the token with keycloak without using any adapters. Please help me out in the process. Thanks in advance Saransh