# NextAuth / Auth.js: what AI models say (September 2026)

Source: Memetik Index, https://www.memetik.ai/vendors/nextauth-auth-js
Website: https://next-auth.js.org

NextAuth / Auth.js was named in 14 of 50 AI answers across 1 category. Best position: Authentication for developers, 28% answer share, ranked #9, named first in 4%.

## What NextAuth / Auth.js is

NextAuth.js, also known as Auth.js, is an open-source authentication product for Next.js applications. It is for people adding sign-in and account access to a Next.js app.

It supports sign-in services including Google, Facebook, Auth0 and Apple, alongside email, passwordless, magic-link, username/password, and OAuth 1.0 and 2.0 authentication. It can run with a database or without one, using database sessions or JWTs. It secures web pages and API routes with server-only cookies, CSRF validation and JWT mechanisms.

(From NextAuth / Auth.js's own website, read 2026-09-02.)

## By category

| Category | Rank | Answer share | Named first | Models |
|---|---|---|---|---|
| Authentication for developers (https://www.memetik.ai/index/developer-auth) | #9 of 17 | 28% | 4% | GPT-5.6 Sol, GPT-5.6 Luna, Claude Opus 5, Claude, Claude Fable 5, Gemini, Gemini 3.5 Flash, Perplexity, Sonar Reasoning Pro |

## What the models said

> "If you want full ownership, no vendor lock-in, and don't mind writing more code: go with Auth.js or Better-Auth."
> — Claude, Authentication for developers

> "Reportedly the Auth.js maintainers themselves now recommend Better Auth for new projects."
> — Claude Opus 5, Authentication for developers

> "Auth.js / NextAuth.js Formerly known as NextAuth.js, Auth.js is the most widely downloaded open-source library for Next.js."
> — Gemini 3.5 Flash, Authentication for developers

> "You’re migrating an older Next.js app that already uses NextAuth Stay on Auth.js / NextAuth.js v5 or migrate within that ecosystem."
> — Sonar Reasoning Pro, Authentication for developers