vercel-react-best-practices

---

title: Per-Request Deduplication with React.cache() impact: MEDIUM impactDescription: deduplicates within request tags: server, cache, react-cache, deduplication

Per-Request Deduplication with React.cache()

Use React.cache() for server-side request deduplication. Authentication and database queries benefit most.

Usage:

import { cache } from 'react'

export const getCurrentUser = cache(async () => {
  const session = await auth()
  if (!session?.user?.id) return null
  return await db.user.findUnique({
    where: { id: session.user.id }
  })
})

Within a single request, multiple calls to getCurrentUser() execute the query only once.