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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallNext.js `after()` schedules work to run after a response or prerender finishes. It does not make a route dynamic, and its callback’s access to request data depends on where you register it. Use it for secondary work such as logging or analytics—not as a substitute for a durable background-job system.
What does Next.js `after()` do?
Import `after` from next/server and pass it a callback. Next.js runs that callback after the response or prerender completes, so tasks such as logging and analytics need not delay the main response. The API is available in Server Components, Server Functions, Route Handlers, and Proxy. See the official `after()` API reference.
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The callback runs within the route’s default or configured maximum duration. The API reference says it runs even if the response does not complete successfully, including when an error is thrown or `notFound` or `redirect` is called. That describes when the callback is scheduled to run; it does not promise retries, exactly-once execution, or durable completion.
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No. Next.js documents `after` as not being a Dynamic API, so calling it does not make a route dynamic. In a static page, the callback runs when the page is built or revalidated—not once for each visitor. If work must happen for every incoming request, do not assume that registering `after()` in static rendering creates a per-request hook.
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Can `cookies()` or `headers()` run inside the callback?
It depends on the context where `after()` is registered. In Route Handlers and Server Functions, the callback may call request APIs such as `cookies()` and `headers()` directly. In a Server Component—including a page, layout, or `generateMetadata`—those APIs cannot be called from inside the callback.
For a Server Component, read the needed request value during rendering, then close over it in the callback. With Cache Components, components that read request data such as cookies or headers must be wrapped in <Suspense> so the rest of the page can be prerendered into a static shell.
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Does `after()` guarantee background work will finish?
No such guarantee is documented. The callback is bounded by the route’s platform or configured maximum duration. The reference does not describe `after()` as a durable job queue, nor does it establish automatic retries or exactly-once processing. Use it for secondary work whose loss or interruption is acceptable; use an appropriate durable job mechanism when completion and recovery are requirements.
The API also supports nesting `after()` calls and using React cache to deduplicate functions invoked inside a callback. Those features do not change the callback’s duration limit or add job-queue guarantees.
Will `after()` work on my deployment platform?
Support depends on the runtime. The current API reference lists Node.js servers and Docker containers as supported, static export as unsupported, and adapters as platform-specific. On serverless platforms, the platform must keep the invocation alive for deferred promises. Next.js describes this through waitUntil(promise); a serverless implementation needs an equivalent integration.
- Node.js server or Docker: listed as supported in the current reference.
- Static export: listed as unsupported.
- Serverless or adapter: check the platform’s implementation for deferred work support, including an equivalent of
waitUntil.
Which Next.js versions include stable `after()`?
`after` became stable in Next.js 15.1.0. It was introduced as `unstable_after` in Next.js 15.0.0-rc. The Next.js 15.1 announcement describes stabilization work, including self-hosted support, fixes involving other features, platform extensibility through `waitUntil`, and runtime API support in Server Actions and Route Handlers. For current projects, use the stable `after` import from next/server; older version-specific examples may use the unstable name.
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