---

name: nextjs-v16 description: Next.js 16 migration guide (async request APIs, "use cache", Turbopack) version: 1.1.0 category: toolchain progressive_disclosure: entry_point: summary: "Next.js 16 migration: async request APIs + opt-in caching" tags: [nextjs, nextjs-16]

Next.js 16

• Async params/cookies/headers; opt-in caching via "use cache"; Turbopack default.

Anti-patterns:

• ❌ Sync request APIs; ✅ await params, cookies(), and headers().
• ❌ Keep middleware.ts; ✅ use proxy.ts and export function proxy.
• ❌ revalidateTag("posts"); ✅ revalidateTag("posts", "max") or { expire: ... }.

References: references/migration-checklist.md, references/cache-components.md, references/turbopack.md