Auth.js · build / TypeScript

v4 code in a v5 app (getServerSession, authOptions)

Module '"next-auth"' has no exported member 'NextAuthOptions'. · getServerSession(authOptions)

What it means

Your AI agent wrote NextAuth v4 code. A lot of tutorials and training data are from v4, so agents mix the two APIs unless you tell them which version you use.

Common causes

• getServerSession(authOptions) and next-auth/next imports
• NextAuthOptions (renamed NextAuthConfig)
• export { default } from "next-auth/middleware"
• @next-auth/prisma-adapter (now @auth/prisma-adapter)

How to fix it

1. Call auth() from your auth.ts everywhere on the server
2. Export auth as proxy in proxy.ts (Next.js 16 renamed middleware.ts)
3. Add a rule telling your agent the project uses Auth.js v5 and to check package.json before writing auth code

- import { getServerSession } from "next-auth/next"
- const session = await getServerSession(authOptions)
+ import { auth } from "@/auth"
+ const session = await auth()

Prompt for Cursor or Claude Code

This project uses Auth.js v5 (next-auth@5). Search for getServerSession, authOptions, NextAuthOptions, next-auth/next, next-auth/middleware, getToken and @next-auth/ imports and migrate each one to the v5 auth() API. List every file you change.

Not quite your error? Paste yours into the free VibeBoot Doctor or browse the Auth.js error fixer.