state-in-url

SSR-safe useUrlState in Next.js App Router. Forward searchParams from server pages (awaiting the Promise in Next.js 15+) rather than calling useSearchParams(), decide between useHistory true/false, keep pages prerenderable, and use a Proxy (formerly middleware) to expose query params to server layouts. App Router only — Pages Router is not supported. Load this skill for any use of state-in-url/next or anytime URL state must be correct on first paint.