nuxt-better-auth

name	nuxt-better-auth
description	Use when implementing auth in Nuxt apps with @onmax/nuxt-better-auth - provides useUserSession composable, server auth helpers, route protection, and Better Auth plugins integration.
license	MIT

Nuxt Better Auth

Authentication module for Nuxt 4+ built on Better Auth. Provides composables, server utilities, and route protection.

Alpha Status: This module is currently in alpha (v0.0.2-alpha.8) and not recommended for production use. APIs may change.

When to Use

• Installing/configuring @onmax/nuxt-better-auth
• Implementing login/signup/signout flows
• Protecting routes (client and server)
• Accessing user session in API routes
• Integrating Better Auth plugins (admin, passkey, 2FA)
• Setting up database with NuxtHub

For Nuxt patterns: use nuxt skill For NuxtHub database: use nuxthub skill

Available Guidance

File	Topics
references/installation.md	Module setup, env vars, config files
references/client-auth.md	useUserSession, signIn/signUp/signOut, safe redirects
references/server-auth.md	serverAuth, getUserSession, requireUserSession
references/route-protection.md	routeRules, definePageMeta, middleware
references/plugins.md	Better Auth plugins (admin, passkey, 2FA)
references/database.md	NuxtHub integration, Drizzle schema
references/types.md	AuthUser, AuthSession, type augmentation

Usage Pattern

Load based on context:

• Installing module? → references/installation.md
• Login/signup forms? → references/client-auth.md
• API route protection? → references/server-auth.md
• Route rules/page meta? → references/route-protection.md
• Using plugins? → references/plugins.md
• Database setup? → references/database.md
• TypeScript types? → references/types.md

DO NOT read all files at once. Load based on context.

Key Concepts

Concept	Description
useUserSession()	Client composable - user, session, loggedIn, signIn/Out methods
requireUserSession()	Server helper - throws 401/403 if not authenticated
auth route mode	'user', 'guest', { user: {...} }, or false
serverAuth()	Get Better Auth instance in server routes

Quick Reference

// Client: useUserSession()
const { user, loggedIn, signIn, signOut } = useUserSession()
await signIn.email({ email, password }, { onSuccess: () => navigateTo('/') })

// Server: requireUserSession()
const { user } = await requireUserSession(event, { user: { role: 'admin' } })

// nuxt.config.ts: Route protection
routeRules: {
  '/admin/**': { auth: { user: { role: 'admin' } } },
  '/login': { auth: 'guest' },
  '/app/**': { auth: 'user' }
}

Resources

• Module Docs
• Better Auth Docs

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Token efficiency: Main skill ~300 tokens, each sub-file ~800-1200 tokens