authjs-knowledge-patch

What problem does it solve?

Provides concise, verified guidance to prevent broken Auth.js (NextAuth) integrations when upgrading to Auth.js v5, reducing runtime errors and deprecated-pattern bugs caused by training-cutoff knowledge gaps.

Core Features & Use Cases

• Next.js 16 proxy.ts migration: explains proxy.ts replacing middleware.ts and how to export auth as proxy or wrap it with custom logic.
• Provider behavior changes: documents idToken:false behavioral change and how Auth.js now consults userinfo endpoints.
• WebAuthn / Passkeys setup: lists peer dependencies, required Authenticator table schema, Prisma adapter notes, and custom signin flow examples.
• Configuration & env guidance: covers auth.ts/auth.config split, AUTH_ environment variable conventions, cookie prefix changes, and adapter package renames.
• Use Case: migrating a Next.js app from Auth.js v4 to v5 while enabling passkeys and preserving server/edge adapter compatibility.

Quick Start

Apply the authjs-knowledge-patch to update my Next.js Auth.js configuration to v5 including proxy.ts migration, idToken adjustments, and WebAuthn/passkey setup.