How to Add Enterprise SSO to a Vue App (OIDC, Step by Step)

Enterprise SSO in a Vue single-page application can be implemented with oidc-client-ts and Vue Router using three routes: a login route that starts an OpenID Connect authorization-code flow, a dedicated callback route that completes the PKCE-protected token exchange, and protected routes guarded by an asynchronous session check. Because the browser-based Vue app is an OAuth public client, it cannot safely retain a client secret, must use exact registered redirect URIs, and should avoid deprecated implicit-flow response types. The guide identifies callback and router-guard timing races as a frequent source of intermittent login failures, recommending that callback routes be excluded from global guards and that guards await the actual authentication promise rather than relying on synchronously populated client-side state. It also emphasizes that localStorage, sessionStorage, IndexedDB, and in-memory token storage cannot fully prevent token theft if malicious JavaScript executes on the application’s origin, as described in RFC 10017. For applications handling high-value or regulated data, it presents a Backend-for-Frontend architecture, where a server manages tokens through a cookie-based session, as a more protective alternative to direct browser token handling.

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