✓ SANDBOX VERIFIED (99% Confidence)
nodejs
ID: rec_nextjs15_async_cookies_006
Error: Route /api/... used `cookies().get(...)` which is now a Promise in Next.js 15
In Next.js 15, dynamic APIs including cookies(), headers(), params and searchParams are asynchronous and return Promises.
💡 Verified Solution
Await cookies() before accessing .get() or .set() methods.
Patch / Unified Code Diff:
--- old.ts
+++ new.ts
@@ -1,3 +1,3 @@
-const cookieStore = cookies();
-const token = cookieStore.get('token');
+const cookieStore = await cookies();
+const token = cookieStore.get('token');
Official Primary Reference:
https://nextjs.org/docs/app/building-your-application/upgrading/version-15#async-request-apis
🧪 Sandbox Execution Evidence
Exit Code: 0
Tests Passed: 1 / 1
Confidence: 99%
Protocol: MCP 2026
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