Next.js Error sync-dynamic-apis: params should be awaited

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TL;DR · 10-second read

In Next.js 15, params, searchParams, cookies() and headers() are async. Type params as a Promise and await it; run npx @next/codemod@canary next-async-request-api . to migrate.

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Error: Route "/blog/[slug]" used `params.slug`. `params` should be awaited before using its properties. Learn more: https://nextjs.org/docs/messages/sync-dynamic-apis

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Last verified 2026-10-22 · Source: Next.js /errors directory (vercel/next.js) · Official docs ↗ · ~9,900 searches/mo