ScriptsApr 11, 2026·1 min read

Auth.js (NextAuth) — Authentication for the Web

Auth.js (formerly NextAuth.js) is a complete open-source authentication solution for Next.js, SvelteKit, Remix, Express, and more. 80+ OAuth providers, passwordless, magic links, database or JWT sessions, and first-class TypeScript.

SC
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Quick Use

Use it first, then decide how deep to go

This block should tell both the user and the agent what to copy, install, and apply first.

npm i next-auth@beta  # Auth.js v5 for Next.js App Router
// auth.ts
import NextAuth from "next-auth";
import GitHub from "next-auth/providers/github";
import Google from "next-auth/providers/google";

export const { handlers, auth, signIn, signOut } = NextAuth({
  providers: [GitHub, Google],
});
// app/api/auth/[...nextauth]/route.ts
export { GET, POST } from "@/auth";
// app/page.tsx
import { auth, signIn, signOut } from "@/auth";

export default async function Page() {
  const session = await auth();
  if (!session) return <button onClick={() => signIn()}>Sign in</button>;
  return <p>Hello {session.user?.name}</p>;
}
Intro

Auth.js (formerly NextAuth.js) is a complete open-source authentication solution for modern web apps. Originally built for Next.js, now framework-agnostic with official integrations for SvelteKit, Remix, Express, Solid Start, and Qwik. The most popular auth library in the JS ecosystem.

What Auth.js Does

  • 80+ OAuth providers — GitHub, Google, Apple, Auth0, Azure AD, Okta, Discord
  • Credentials — email/password via custom callback
  • Magic links — passwordless email login
  • Sessions — JWT (stateless) or database (persistent)
  • Database adapters — Prisma, Drizzle, Mongoose, Supabase, Firebase, TypeORM
  • Callbacks — customize every step (signIn, jwt, session, redirect)
  • CSRF protection — built-in
  • Edge runtime — Cloudflare Workers, Vercel Edge

Architecture

Auth.js exposes handlers + helpers. Next.js route handler handles OAuth redirects and callback URLs. Session is either JWT cookie (stateless) or DB lookup via adapter. auth() helper works in RSC, middleware, Route Handlers.

Self-Hosting

Library — runs inside your app. No external service. You bring your own provider credentials and database.

AUTH_SECRET=...
GITHUB_ID=...
GITHUB_SECRET=...

Key Features

  • 80+ OAuth providers built in
  • JWT or DB sessions
  • Database adapters (Prisma, Drizzle, Supabase, etc.)
  • Multi-framework (Next, Svelte, Remix, Express, Solid, Qwik)
  • Edge runtime compatible
  • Magic link email sign-in
  • TypeScript-first
  • Zero vendor lock-in

Comparison

Library Self-Host Providers Sessions Frameworks
Auth.js Yes 80+ JWT/DB Multi
Clerk No (SaaS) 20+ Managed Multi
Lucia Yes DIY DB Framework-agnostic
Better-Auth Yes 20+ DB Multi
Supabase Auth Yes (via Supabase) OAuth + email Managed Multi

常见问题 FAQ

Q: v4 vs v5 区别？ A: v5 (Auth.js) 支持 App Router、edge runtime、简化配置，不再是 pages/api/auth/[...nextauth] 而是 auth.ts。

Q: JWT vs DB session？ A: JWT 无状态（扩展简单），但无法立即踢用户下线。DB session 有状态（可撤销）但每请求多一次查询。

Q: 和 Lucia 比？ A: Auth.js 开箱即用（80+ providers）；Lucia 更底层、灵活度高，需要自己写 provider 适配。

来源与致谢 Sources

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