| name | better-auth |
| description | Complete Better Auth - 40+ OAuth providers, 20+ plugins, all adapters, all frameworks. Use when implementing authentication, login, OAuth, 2FA, magic links, SSO, Stripe, SCIM, or session management. Use when this capability is needed. |
| metadata | {"author":"fusengine"} |
Better Auth - Complete Authentication
TypeScript-first authentication library with 40+ OAuth providers and 20+ plugins.
Agent Workflow (MANDATORY)
Before ANY implementation, use TeamCreate to spawn 3 agents:
- fuse-ai-pilot:explore-codebase - Analyze existing auth setup and patterns
- fuse-ai-pilot:research-expert - Verify latest Better Auth docs via Context7/Exa
- mcp__context7__query-docs - Check providers/plugins availability
After implementation, run fuse-ai-pilot:sniper for validation.
Overview
When to Use
- Implementing authentication in TypeScript/JavaScript applications
- Need OAuth providers (Google, GitHub, Discord, Apple, Microsoft, etc.)
- Adding 2FA, magic links, passkeys, or phone authentication
- Enterprise SSO with SAML, SCIM provisioning, or organizations
- Integrating payments with Stripe or Polar subscriptions
- Web3 authentication with Sign-In with Ethereum (SIWE)
- Migrating from Auth.js, Clerk, Auth0, Supabase, or WorkOS
Why Better Auth
| Feature | Benefit |
|---|
| Framework agnostic | Next.js, SvelteKit, Nuxt, Remix, Astro, Expo, NestJS |
| Plugin architecture | Add only the features you need (20+ plugins) |
| Full TypeScript | End-to-end type safety, inference included |
| Self-hosted | Your data stays on your infrastructure |
| Database flexible | Prisma, Drizzle, MongoDB, PostgreSQL, MySQL, SQLite |
| Enterprise ready | SSO, SCIM, organizations, audit logs |
Coverage
OAuth Providers (40+)
Google, GitHub, Discord, Apple, Microsoft, Slack, Spotify, Twitter/X, Facebook, LinkedIn, GitLab, Bitbucket, Dropbox, Twitch, Reddit, TikTok, and 25+ more documented in providers/.
Plugins (20+)
| Plugin | Purpose |
|---|
| 2FA | TOTP authenticator, backup codes |
| Magic Link | Passwordless email login |
| Passkey | WebAuthn biometric authentication |
| Organization | Multi-tenant, roles, invitations |
| SSO | Enterprise SAML/OIDC single sign-on |
| SCIM | Directory sync, user provisioning |
| Stripe | Subscription billing integration |
| API Key | Machine-to-machine authentication |
| JWT/Bearer | Token-based API authentication |
Database Adapters
Prisma, Drizzle, MongoDB, raw SQL (PostgreSQL, MySQL, SQLite), and community adapters.
SOLID Architecture (Next.js 16)
Components organized in modules/auth/ following separation of concerns:
- Services:
betterAuth configuration and initialization
- Hooks:
createAuthClient for client-side auth state
- API Route:
app/api/auth/[...all]/route.ts handler
- Proxy:
proxy.ts for route protection (replaces middleware)
Reference Guide
Best Practices
- Plugins on demand - Only add plugins you actually need
- Type-safe client - Use generated types from server config
- Session caching - Enable session caching for performance
- Rate limiting - Configure rate limits for auth endpoints
- Secure cookies - Use secure, httpOnly, sameSite cookies
- Database indexes - Add indexes on user lookup fields
Concepts
Core concepts explained in concepts/:
- Sessions - Token management, refresh, revocation
- Database - Schema design, migrations, adapters
- Plugins - Extension system, composition
- OAuth - Provider configuration, callbacks
- Security - CSRF, rate limiting, password hashing
- Cookies - Session storage, cross-domain
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