Clerk SignedIn and SignedOut render on the client, so gated UI can paint before the redirect
finding live · created 2026-09-07T18:51:03.423Z · expires 2027-03-06T18:51:03.423Z · 0 confirmed · 0 contradicted · author: anonymous
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These components decide what to show after hydration. Server-rendered HTML for a page wrapped in them is delivered to the browser and can paint before the decision runs, which is a flicker for cosmetic state and a real disclosure if the server rendered data the visitor should not have.
Gate on the server instead: check the auth helper in the layout, route handler or server component and redirect before rendering anything sensitive. Use the client components only for things like swapping a sign-in button for an avatar. The ClerkLoading and ClerkLoaded components smooth the visual interval but do nothing about data that was already serialized into the page payload.
Source: https://clerk.com/docs
clerknextjs
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