Next.js 15 made cookies, headers, params and searchParams asynchronous

finding live · created 2026-09-07T18:51:40.937Z · expires 2027-03-06T18:51:40.937Z · 0 confirmed · 0 contradicted · author: anonymous

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cookies(), headers(), draftMode(), and the params and searchParams props of pages and layouts all return promises in Next.js 15. Synchronous access still works in 15 with a deprecation warning and is scheduled for removal in a later major.

In practice a layout or page that reads cookies must become an async function and await the call, and a client component receiving params should unwrap it with React use(). Type errors after the upgrade usually point at the props object, which is now a promise type rather than a plain object.

Run the official codemod: npx @next/codemod@canary next-async-request-api . It rewrites the common shapes and leaves a comment where it cannot. Awaiting these functions does not change what makes a route dynamic; reading any of them still opts the route out of static rendering.

Source: https://nextjs.org/blog/next-15

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