neon-auth-nextjs

por neondatabase

Configura o Neon Auth em aplicações Next.js App Router. Configura rotas de API, middleware, componentes de servidor e interface de usuário. Use ao adicionar apenas autenticação a aplicações Next.js…

npx skills add https://github.com/neondatabase/neon-js --skill neon-auth-nextjs
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13

Neon Auth for Next.js

Help developers set up @neondatabase/auth in Next.js App Router applications (auth only, no database).

When to Use

Use this skill when:

  • Setting up Neon Auth in Next.js (App Router)
  • User mentions "next.js", "next", or "app router" with Neon Auth
  • Auth-only setup (no database needed)

Critical Rules

  1. Server vs Client imports: Use correct import paths
  2. 'use client' directive: Required for client components using hooks
  3. CSS Import: Choose ONE - either /ui/css OR /ui/tailwind, never both
  4. onSessionChange: Always call router.refresh() to update Server Components

Critical Imports

PurposeImport From
Unified Server (createNeonAuth)@neondatabase/auth/next/server
Client Auth@neondatabase/auth/next
UI Components@neondatabase/auth/react/ui
View Paths (static params)@neondatabase/auth/react/ui/server

Note: Use createNeonAuth() from @neondatabase/auth/next/server to get a unified auth instance that provides:

  • .handler() - API route handler
  • .middleware() - Route protection middleware
  • All Better Auth server methods (.signIn, .signUp, .getSession, etc.)

Setup

1. Install

npm install @neondatabase/auth

2. Environment (.env.local)

NEON_AUTH_BASE_URL=https://your-auth.neon.tech
NEON_AUTH_COOKIE_SECRET=your-secret-at-least-32-characters-long

Important: Generate a secure secret (32+ characters) for production:

openssl rand -base64 32

3. Server Setup (lib/auth/server.ts)

Create a auth instance that provides handler, middleware, and server methods:

import { createNeonAuth } from '@neondatabase/auth/next/server';

export const auth = createNeonAuth({
  baseUrl: process.env.NEON_AUTH_BASE_URL!,
  cookies: {
    secret: process.env.NEON_AUTH_COOKIE_SECRET!,
    sessionDataTtl: 300,          // Optional: session data cache TTL in seconds (default: 300 = 5 min)
    domain: '.example.com',       // Optional: for cross-subdomain cookies
  },
});

4. API Route (app/api/auth/[...path]/route.ts)

import { auth } from '@/lib/auth/server';

export const { GET, POST } = auth.handler();

5. Middleware (middleware.ts)

import { auth } from '@/lib/auth/server';

export default auth.middleware({
  loginUrl: '/auth/sign-in',
});

export const config = {
  matcher: ['/dashboard/:path*', '/account/:path*'],
};

6. Client (lib/auth/client.ts)

'use client';
import { createAuthClient } from '@neondatabase/auth/next';

export const authClient = createAuthClient();

7. Provider (app/providers.tsx)

'use client';
import { NeonAuthUIProvider } from '@neondatabase/auth/react/ui';
import Link from 'next/link';
import { useRouter } from 'next/navigation';
import { authClient } from '@/lib/auth/client';

export function Providers({ children }: { children: React.ReactNode }) {
  const router = useRouter();

  return (
    <NeonAuthUIProvider
      authClient={authClient}
      navigate={router.push}
      replace={router.replace}
      onSessionChange={() => router.refresh()}
      redirectTo="/dashboard"
      Link={({href, children}) => <Link to={href}>{children}</Link>}
    >
      {children}
    </NeonAuthUIProvider>
  );
}

8. Layout (app/layout.tsx)

import { Providers } from './providers';
import '@neondatabase/auth/ui/css';

export default function RootLayout({ children }: { children: React.ReactNode }) {
  return (
    <html lang="en">
      <body>
        <Providers>{children}</Providers>
      </body>
    </html>
  );
}

9. Auth Pages (app/auth/[path]/page.tsx)

import { AuthView } from '@neondatabase/auth/react/ui';
import { authViewPaths } from '@neondatabase/auth/react/ui/server';

export function generateStaticParams() {
  return Object.values(authViewPaths).map((path) => ({ path }));
}

export default async function AuthPage({ params }: { params: Promise<{ path: string }> }) {
  const { path } = await params;
  return <AuthView pathname={path} />;
}

CSS & Styling

Import Options

Without Tailwind (pre-built CSS bundle ~47KB):

// app/layout.tsx
import '@neondatabase/auth/ui/css';

With Tailwind CSS v4 (app/globals.css):

@import 'tailwindcss';
@import '@neondatabase/auth/ui/tailwind';

IMPORTANT: Never import both - causes duplicate styles.

Dark Mode

The provider includes next-themes. Control via defaultTheme prop:

<NeonAuthUIProvider
  defaultTheme="system" // 'light' | 'dark' | 'system'
  // ...
>

Custom Theming

Override CSS variables in globals.css:

:root {
  --primary: hsl(221.2 83.2% 53.3%);
  --primary-foreground: hsl(210 40% 98%);
  --background: hsl(0 0% 100%);
  --foreground: hsl(222.2 84% 4.9%);
  --card: hsl(0 0% 100%);
  --card-foreground: hsl(222.2 84% 4.9%);
  --border: hsl(214.3 31.8% 91.4%);
  --input: hsl(214.3 31.8% 91.4%);
  --ring: hsl(221.2 83.2% 53.3%);
  --radius: 0.5rem;
}

.dark {
  --background: hsl(222.2 84% 4.9%);
  --foreground: hsl(210 40% 98%);
  /* ... dark mode overrides */
}

NeonAuthUIProvider Props

Full configuration options:

<NeonAuthUIProvider
  // Required
  authClient={authClient}

  // Navigation (Next.js specific)
  navigate={router.push}        // router.push for navigation
  replace={router.replace}      // router.replace for redirects
  onSessionChange={() => router.refresh()} // Refresh Server Components!
  redirectTo="/dashboard"       // Where to redirect after auth
  Link={({href, children}) => <Link to={href}>{children}</Link>}                   // Next.js Link component

  // Social/OAuth Providers
  social={{
    providers: ['google'],
  }}

  // Feature Flags
  emailOTP={true}               // Enable email OTP sign-in
  emailVerification={true}      // Require email verification
  magicLink={false}             // Magic link (disabled by default)
  multiSession={false}          // Multiple sessions (disabled)

  // Credentials Configuration
  credentials={{
    forgotPassword: true,       // Show forgot password link
  }}

  // Sign Up Fields
  signUp={{
    fields: ['name'],           // Additional fields: 'name', 'username', etc.
  }}

  // Account Settings Fields
  account={{
    fields: ['image', 'name', 'company', 'age', 'newsletter'],
  }}

  // Organization Features
  organization={{}}             // Enable org features

  // Dark Mode
  defaultTheme="system"         // 'light' | 'dark' | 'system'

  // Custom Labels
  localization={{
    SIGN_IN: 'Welcome Back',
    SIGN_UP: 'Create Account',
    FORGOT_PASSWORD: 'Forgot Password?',
    OR_CONTINUE_WITH: 'or continue with',
  }}
>
  {children}
</NeonAuthUIProvider>

Server Components (RSC)

Get Session in Server Component

// NO 'use client' - this is a Server Component
import { auth } from '@/lib/auth/server';

// Server components using `auth` methods must be rendered dynamically
export const dynamic = 'force-dynamic'

export async function Profile() {
  const { data: session } = await auth.getSession();

  if (!session?.user) return <div>Not signed in</div>;

  return (
    <div>
      <p>Hello, {session.user.name}</p>
      <p>Email: {session.user.email}</p>
    </div>
  );
}

Route Handler with Auth

// app/api/user/route.ts
import { auth } from '@/lib/auth/server';
import { NextResponse } from 'next/server';

export async function GET() {
  const { data: session } = await auth.getSession();

  if (!session?.user) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
  }

  return NextResponse.json({ user: session.user });
}

Server Actions

Server actions use the same auth instance from lib/auth/server.ts:

Sign In Action

// app/actions/auth.ts
'use server';
import { auth } from '@/lib/auth/server';
import { redirect } from 'next/navigation';

export async function signIn(formData: FormData) {
  const { error } = await auth.signIn.email({
    email: formData.get('email') as string,
    password: formData.get('password') as string,
  });

  if (error) {
    return { error: error.message };
  }

  redirect('/dashboard');
}

export async function signUp(formData: FormData) {
  const { error } = await auth.signUp.email({
    email: formData.get('email') as string,
    password: formData.get('password') as string,
    name: formData.get('name') as string,
  });

  if (error) {
    return { error: error.message };
  }

  redirect('/dashboard');
}

export async function signOut() {
  await auth.signOut();
  redirect('/');
}

Available Server Methods

The auth instance from createNeonAuth() provides all Better Auth server methods:

// Authentication
auth.signIn.email({ email, password })
auth.signUp.email({ email, password, name })
auth.signOut()
auth.getSession()

// User Management
auth.updateUser({ name, image })

// Organizations
auth.organization.create({ name, slug })
auth.organization.list()

// Admin (if enabled)
auth.admin.listUsers()
auth.admin.banUser({ userId })

Client Components

Session Hook

'use client';
import { authClient } from '@/lib/auth/client';

export function Dashboard() {
  const { data: session, isPending, error } = authClient.useSession();

  if (isPending) return <div>Loading...</div>;
  if (error) return <div>Error: {error.message}</div>;
  if (!session) return <div>Not signed in</div>;

  return <div>Hello, {session.user.name}</div>;
}

Client-Side Auth Methods

'use client';
import { authClient } from '@/lib/auth/client';

// Sign in
await authClient.signIn.email({ email, password });

// Sign up
await authClient.signUp.email({ email, password, name });

// OAuth
await authClient.signIn.social({
  provider: 'google',
  callbackURL: '/dashboard',
});

// Sign out
await authClient.signOut();

// Get session
const session = await authClient.getSession();

UI Components

AuthView - Main Auth Interface

import { AuthView } from '@neondatabase/auth/react/ui';

// Handles: sign-in, sign-up, forgot-password, reset-password, callback, sign-out
<AuthView pathname={path} />

Conditional Rendering

import {
  SignedIn,
  SignedOut,
  AuthLoading,
  RedirectToSignIn,
} from '@neondatabase/auth/react/ui';

function MyPage() {
  return (
    <>
      <AuthLoading>
        <LoadingSpinner />
      </AuthLoading>

      <SignedIn>
        <Dashboard />
      </SignedIn>

      <SignedOut>
        <LandingPage />
      </SignedOut>

      {/* Auto-redirect if not signed in */}
      <RedirectToSignIn />
    </>
  );
}

UserButton

import { UserButton } from '@neondatabase/auth/react/ui';

function Header() {
  return (
    <header>
      <nav>...</nav>
      <UserButton />
    </header>
  );
}

Account Management

import {
  AccountSettingsCards,
  SecuritySettingsCards,
  SessionsCard,
  ChangePasswordCard,
  ChangeEmailCard,
  DeleteAccountCard,
  ProvidersCard,
} from '@neondatabase/auth/react/ui';

Organization Components

import {
  OrganizationSwitcher,
  OrganizationSettingsCards,
  OrganizationMembersCard,
  AcceptInvitationCard,
} from '@neondatabase/auth/react/ui';

Social/OAuth Providers

Configuration

<NeonAuthUIProvider
  social={{
    providers: ['google'],
  }}
>

Programmatic OAuth

// Client-side
await authClient.signIn.social({
  provider: 'google',
  callbackURL: '/dashboard',
});

Supported Providers

google, github, twitter, discord, apple, microsoft, facebook, linkedin, spotify, twitch, gitlab, bitbucket

Middleware Configuration

Basic Protected Routes

import { auth } from '@/lib/auth/server';

export default auth.middleware({
  loginUrl: '/auth/sign-in',
});

export const config = {
  matcher: ['/dashboard/:path*', '/account/:path*', '/settings/:path*'],
};

Custom Logic

import { auth } from '@/lib/auth/server';
import { NextResponse } from 'next/server';

export default auth.middleware({
  loginUrl: '/auth/sign-in',
});

Account Pages Setup

Account Layout (app/account/[path]/page.tsx)

import {
  SignedIn,
  RedirectToSignIn,
  AccountSettingsCards,
  SecuritySettingsCards,
  SessionsCard,
  ChangePasswordCard,
} from '@neondatabase/auth/react/ui';

export default async function AccountPage({ params }: { params: Promise<{ path: string }> }) {
  const { path = 'settings' } = await params;

  return (
    <>
      <RedirectToSignIn />
      <SignedIn>
        {path === 'settings' && <AccountSettingsCards />}
        {path === 'security' && (
          <>
            <ChangePasswordCard />
            <SecuritySettingsCards />
          </>
        )}
        {path === 'sessions' && <SessionsCard />}
      </SignedIn>
    </>
  );
}

Advanced Features

Anonymous Access

Enable RLS-based data access for unauthenticated users:

// lib/auth/client.ts
'use client';
import { createAuthClient } from '@neondatabase/auth/next';

export const authClient = createAuthClient({
  allowAnonymous: true,
});

Get JWT Token

const token = await authClient.getJWTToken();

// Use in API calls
const response = await fetch('/api/data', {
  headers: { Authorization: `Bearer ${token}` },
});

Cross-Tab Sync

Automatic via BroadcastChannel. Sign out in one tab signs out all tabs.

Session Refresh in Server Components

The onSessionChange callback is crucial for Next.js:

<NeonAuthUIProvider
  onSessionChange={() => router.refresh()} // Refreshes Server Components!
  // ...
>

Without this, Server Components won't update after sign-in/sign-out.

Error Handling

Server Actions

'use server';

export async function signIn(formData: FormData) {
  const { error } = await authServer.signIn.email({
    email: formData.get('email') as string,
    password: formData.get('password') as string,
  });

  if (error) {
    // Return error to client
    return { error: error.message };
  }

  redirect('/dashboard');
}

Client Components

'use client';

const { error } = await authClient.signIn.email({ email, password });

if (error) {
  toast.error(error.message);
}

Common Errors

ErrorCause
Invalid credentialsWrong email/password
User already existsEmail already registered
Email not verifiedVerification required
Session not foundExpired or invalid session

FAQ / Troubleshooting

Server Components not updating after sign-in?

Make sure you have onSessionChange={() => router.refresh()} in your provider:

<NeonAuthUIProvider
  onSessionChange={() => router.refresh()}
  // ...
>

Anonymous access not working?

Grant permissions to the anonymous role in your database:

GRANT SELECT ON public.posts TO anonymous;
GRANT SELECT ON public.products TO anonymous;

And configure RLS policies:

CREATE POLICY "Anyone can read published posts"
  ON public.posts FOR SELECT
  USING (published = true);

Middleware not protecting routes?

Check your matcher configuration:

export const config = {
  matcher: [
    '/dashboard/:path*',
    '/account/:path*',
    // Add your protected routes here
  ],
};

OAuth callback errors?

Ensure your API route is set up correctly at app/api/auth/[...path]/route.ts:

import { auth } from '@/lib/auth/server';
export const { GET, POST } = auth.handler();

Session not persisting?

  1. Check cookies are enabled
  2. Verify NEON_AUTH_BASE_URL is correct in .env.local
  3. Verify NEON_AUTH_COOKIE_SECRET is set and at least 32 characters
  4. Make sure you're not in incognito with cookies blocked

Session data cache not working?

  1. Verify NEON_AUTH_COOKIE_SECRET is at least 32 characters long
  2. Check cookies.secret is passed to createNeonAuth()
  3. Optionally configure cookies.sessionDataTtl (default: 300 seconds)

Performance Notes

  • Session data caching: JWT-signed session_data cookie with configurable TTL (default: 5 minutes)
    • Configure via cookies.sessionDataTtl in seconds
    • Enables sub-millisecond session lookups (<1ms)
    • Automatic fallback to upstream /get-session on cache miss
  • Request deduplication: Concurrent calls share single network request (10x faster cold starts)
  • Server Components: Use auth.getSession() for zero-JS session access
  • Cross-tab sync: <50ms via BroadcastChannel
  • Cookie domain: Optional cookies.domain for cross-subdomain cookie sharing

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