use-swr-for-automatic-deduplication

---

name: Use SWR for Automatic Deduplication impact: MEDIUM-HIGH description: automatic deduplication tags: client, swr, deduplication, data-fetching

Use SWR for Automatic Deduplication

SWR enables request deduplication, caching, and revalidation across component instances.

Incorrect (no deduplication, each instance fetches):

Copyfunction UserList() {
  const [users, setUsers] = useState([])
  useEffect(() => {
    fetch('/api/users')
      .then(r => r.json())
      .then(setUsers)
  }, [])
}

Correct (multiple instances share one request):

Copyimport useSWR from 'swr'

function UserList() {
  const { data: users } = useSWR('/api/users', fetcher)
}

For immutable data:

Copyimport { useImmutableSWR } from '@/lib/swr'

function StaticContent() {
  const { data } = useImmutableSWR('/api/config', fetcher)
}

For mutations:

Copyimport { useSWRMutation } from 'swr/mutation'

function UpdateButton() {
  const { trigger } = useSWRMutation('/api/user', updateUser)
  return <button onClick={() => trigger()}>Update</button>
}

Reference: https://swr.vercel.app