> ## Documentation Index
> Fetch the complete documentation index at: https://mintlify.com/better-auth/better-auth/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Better Auth is the most comprehensive authentication framework for TypeScript — framework-agnostic, extensible, and production-ready.

Better Auth is a framework-agnostic, universal authentication and authorization framework for TypeScript. It provides a comprehensive set of features out of the box and includes a plugin ecosystem that simplifies adding advanced functionality. Whether you need 2FA, passkeys, multi-tenancy, multi-session support, or enterprise features like SSO and OIDC, Better Auth lets you focus on building your application instead of reinventing auth.

## Features

Better Auth aims to be the most comprehensive auth library for TypeScript. Here are some of the capabilities available out of the box:

<CardGroup cols={2}>
  <Card title="Email & password" icon="envelope">
    Built-in email and password authentication with configurable password policies, auto sign-in after registration, and email verification.
  </Card>

  <Card title="Social OAuth" icon="key">
    30+ social providers including Google, GitHub, Apple, and Discord. Fully configurable with `clientId`, `clientSecret`, and callback URLs.
  </Card>

  <Card title="Two-factor authentication" icon="shield-halved">
    TOTP-based 2FA with QR code setup, backup codes, and trusted device support via the `twoFactor` plugin.
  </Card>

  <Card title="Passkeys" icon="fingerprint">
    WebAuthn-based passwordless authentication using device biometrics or hardware security keys.
  </Card>

  <Card title="Organizations & multi-tenancy" icon="building">
    Team management with roles, permissions, invitations, and SCIM provisioning via the `organization` plugin.
  </Card>

  <Card title="OIDC & SSO" icon="id-card">
    Act as an OpenID Connect provider or connect to enterprise identity providers using SAML SSO.
  </Card>

  <Card title="Plugin system" icon="puzzle-piece">
    Extend Better Auth with magic links, username auth, phone number, anonymous sessions, API keys, and more.
  </Card>

  <Card title="Database adapters" icon="database">
    Native adapters for Drizzle, Prisma, and MongoDB. Direct support for SQLite, PostgreSQL, and MySQL.
  </Card>

  <Card title="Type-safe by default" icon="code">
    Full TypeScript inference across your server and client — no type casting or manual type definitions needed.
  </Card>

  <Card title="Framework agnostic" icon="layer-group">
    Works with Next.js, Nuxt, SvelteKit, Hono, Express, Expo, and any runtime that supports standard `Request`/`Response` objects.
  </Card>
</CardGroup>

...and much more!

***

## AI tooling

Better Auth provides first-class support for AI-assisted development.

### LLMs.txt

Better Auth exposes an `llms.txt` file that helps AI models understand how to integrate with and configure your authentication system. You can find it at [https://better-auth.com/llms.txt](https://better-auth.com/llms.txt).

### MCP server

Better Auth provides an MCP (Model Context Protocol) server so you can use it with any AI model that supports MCP — including Cursor, Claude Code, and OpenCode.

Use the `auth` CLI to add the Better Auth MCP server to your preferred AI coding assistant:

<Tabs>
  <Tab title="Claude Code">
    ```bash theme={null}
    npx auth mcp --claude-code
    ```
  </Tab>

  <Tab title="Cursor">
    ```bash theme={null}
    npx auth mcp --cursor
    ```
  </Tab>

  <Tab title="OpenCode">
    ```bash theme={null}
    npx auth mcp --open-code
    ```
  </Tab>

  <Tab title="Manual">
    ```bash theme={null}
    npx auth mcp --manual
    ```
  </Tab>
</Tabs>

<Note>
  You can also run `npx auth mcp` without flags to get an interactive setup prompt that walks you through connecting to your MCP client.
</Note>

***

## What's next

<CardGroup cols={2}>
  <Card title="Installation" icon="download" href="/installation">
    Install Better Auth, set up your database, and mount the route handler in your framework.
  </Card>

  <Card title="Basic usage" icon="play" href="/basic-usage">
    Sign users up, sign them in, manage sessions, and use the client SDK.
  </Card>

  <Card title="Plugins overview" icon="puzzle-piece" href="/plugins/overview">
    Explore the full plugin ecosystem — 2FA, organizations, passkeys, SSO, magic links, and more.
  </Card>

  <Card title="API reference" icon="code" href="/reference/options">
    Browse all configuration options and the full public API surface.
  </Card>
</CardGroup>