# OAuth2 / OIDC

The [[OAuth2]] and [[OIDC]] concepts are defined below, with the specificities of an application composed of an [[SPA]] frontend and an API backend. Caution: The names of -almost- the same concept are different between OAuth and OIDC, see the schema at the end of this section.





- https://cljdoc.org/d/keycloak-clojure/keycloak-clojure/1.17.15/doc/security-concepts#oauth2--openid-connect-oidc-concepts