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T3 Stack · Concept

Middleware

T3 Stack authentication middleware uses Next.js middleware and an authorized callback to protect pages and requests. Middleware is an early check, so authorization must also be verified near data fetching.

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Syntax

export { auth as middleware } from "@/auth"

In-depth API docs are only for subscribers: parameters, examples, common mistakes and interview practice.

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  • Next.js middleware
  • NextAuth.js
  • authorized callback
  • auth
  • NextResponse
  • session verification

Source: NextAuth.js • Create T3 App. Checked 2026-11-03.