better-auth

Complete Better Auth documentation in markdown format. Use when implementing authentication in TypeScript projects - covers OAuth providers (Google, GitHub, etc.), email/password, passkeys, 2FA, session management, database adapters (Prisma, Drizzle), and framework integrations (Next.js, SvelteKit, etc.).

SKILL.md

---
name: better-auth
description: Complete Better Auth documentation in markdown format. Use when implementing authentication in TypeScript projects - covers OAuth providers (Google, GitHub, etc.), email/password, passkeys, 2FA, session management, database adapters (Prisma, Drizzle), and framework integrations (Next.js, SvelteKit, etc.).
---

# Better Auth Documentation

Complete Better Auth documentation embedded in markdown. Read from `references/` to answer questions about authentication implementation, OAuth setup, database configuration, and framework integration.

## Documentation Structure

All documentation is in `references/` organized by topic:

### Core Documentation

#### Getting Started
- `references/introduction.mdx` - What is Better Auth
- `references/installation.mdx` - Setup guide
- `references/basic-usage.mdx` - Authentication basics
- `references/comparison.mdx` - vs other auth libraries

#### Authentication Methods (`references/authentication/`)
OAuth providers and authentication strategies:
- `google.mdx` - Google OAuth
- `github.mdx` - GitHub OAuth
- `microsoft.mdx` - Microsoft/Azure AD
- `apple.mdx` - Apple Sign In
- `discord.mdx`, `facebook.mdx`, `twitter.mdx`, etc.
- `email-password.mdx` - Email & password auth
- `magic-link.mdx` - Passwordless magic links
- `passkey.mdx` - WebAuthn passkeys

#### Database Adapters (`references/adapters/`)
- `prisma.mdx` - Prisma ORM
- `drizzle.mdx` - Drizzle ORM
- `kysely.mdx` - Kysely
- `mongodb.mdx` - MongoDB
- `pg.mdx` - node-postgres

#### Concepts (`references/concepts/`)
Core authentication concepts:
- `session.mdx` - Session management
- `oauth.mdx` - OAuth flow
- `database.mdx` - Database schema
- `rate-limit.mdx` - Rate limiting
- `middleware.mdx` - Auth middleware
- `cookies.mdx` - Cookie handling

#### Plugins (`references/plugins/`)
Extension features:
- `two-factor.mdx` - 2FA/TOTP
- `passkey.mdx` - WebAuthn/passkeys
- `email-verification.mdx` - Email verification
- `magic-link.mdx` - Magic link auth
- `organization.mdx` - Organizations & teams
- `multi-session.mdx` - Multiple sessions
- `anonymous.mdx` - Anonymous users

#### Integrations (`references/integrations/`)
Framework-specific guides:
- `next-js.mdx` - Next.js integration
- `sveltekit.mdx` - SvelteKit
- `astro.mdx` - Astro
- `solid-start.mdx` - SolidStart

#### Examples (`references/examples/`)
Working examples:
- `next-js.mdx` - Complete Next.js example
- `sveltekit.mdx` - SvelteKit example

#### Guides (`references/guides/`)
How-to guides:
- `custom-session.mdx` - Custom session handling
- `testing.mdx` - Testing auth flows
- `deployment.mdx` - Production deployment

#### API Reference (`references/reference/`)
Complete API documentation.

## Quick Reference

### Common Tasks

| Task | File to Read |
|------|--------------|
| Initial setup | `references/installation.mdx` |
| Email & password auth | `references/authentication/email-password.mdx` |
| Google OAuth | `references/authentication/google.mdx` |
| GitHub OAuth | `references/authentication/github.mdx` |
| Setup with Prisma | `references/adapters/prisma.mdx` |
| Setup with Drizzle | `references/adapters/drizzle.mdx` |
| Session management | `references/concepts/session.mdx` |
| Add 2FA | `references/plugins/two-factor.mdx` |
| Add passkeys | `references/plugins/passkey.mdx` |
| Next.js integration | `references/integrations/next-js.mdx` |
| Organizations/teams | `references/plugins/organization.mdx` |
| Rate limiting | `references/concepts/rate-limit.mdx` |

### When to Use This Skill

- Implementing authentication in a TypeScript project
- Setting up OAuth providers (Google, GitHub, Microsoft, etc.)
- Configuring database adapters (Prisma, Drizzle, etc.)
- Adding 2FA, passkeys, or magic links
- Managing sessions and cookies
- Integrating with Next.js, SvelteKit, or other frameworks
- Questions about auth patterns and best practices

### How to Navigate

1. **Start with `references/introduction.mdx`** for overview
2. **For setup:** Read `references/installation.mdx`
3. **For auth methods:** Browse `references/authentication/`
4. **For database:** Check `references/adapters/`
5. **For advanced features:** See `references/plugins/`
6. **For framework integration:** Use `references/integrations/`

All files are `.mdx` (Markdown + JSX) but readable as plain markdown.