Tag: app-router

2 articles

Fix: Next.js 15 cookies() Should Be Awaited — Route Used cookies, Cannot Modify Errors, and Library Mismatch

Jun 2, 2026

Fix Next.js 15 async cookies() and headers() errors — 'Route used cookies', 'Cookies can only be modified in a Server Action or Route Handler', codemod misses, library compatibility, and TypeScript type mismatches after upgrade.

nextjs react app-router typescript server-components

Fix: Next.js 'params should be awaited before using its properties'

May 18, 2026

How to fix Next.js 15 async params and searchParams errors — await in Server Components, React.use in Client Components, generateMetadata, generateStaticParams, and the codemod migration path.

nextjs react app-router typescript server-components