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How to solve async params TypeScript errors in Next.js 16 API routes?

November 28, 2025

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Dynamic params are now Promises; type as { params: Promise<{ id: string }> } and await params to resolve TS complaints.

‍Example:

Code

// app/api/[id]/route.ts
export async function GET(
  _req: Request,
  { params }: { params: Promise<{ id: string }> }
) {
  const { id } = await params;
  return Response.json({ id });
}
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How to solve async params TypeScript errors in Next.js 16 API routes?

Dynamic params are now Promises; type as { params: Promise<{ id: string }> } and await params to resolve TS complaints.

‍Example:

Code

// app/api/[id]/route.ts
export async function GET(
  _req: Request,
  { params }: { params: Promise<{ id: string }> }
) {
  const { id } = await params;
  return Response.json({ id });
}