What is Better Auth?

Better Auth is a modern, open-source authentication and authorization framework designed for the TypeScript ecosystem. It provides a comprehensive set of features out of the box, including support for email/password authentication, social sign-on (OAuth), two-factor authentication (2FA), multi-tenancy, and more. Better Auth is framework-agnostic, meaning it can be integrated into various TypeScript-based frameworks such as Next.js, SvelteKit, Astro, and TanStack Start .

The primary goal of Better Auth is to simplify the implementation of authentication systems by offering a robust, extensible, and type-safe solution. It allows developers to focus on building their applications without reinventing the wheel when it comes to user authentication and authorization.

Major Use Cases of Better Auth

1. Secure User Authentication: Implement secure login mechanisms using email/password, social logins (Google, GitHub, Apple, Discord), and more.
2. Two-Factor Authentication (2FA): Enhance security by adding an additional layer of authentication, such as SMS or authenticator apps.
3. Multi-Tenant Applications: Manage organizations, teams, and access control for applications that serve multiple clients or user groups.
4. Session Management: Handle user sessions with features like session expiration, revocation, and multi-session support.
5. Custom Authentication Flows: Extend the authentication system with custom plugins to meet specific application requirements.
6. Integration with Modern Frameworks: Seamlessly integrate with popular TypeScript frameworks, providing a consistent authentication experience across different platforms.

How Better Auth Works – Architecture Overview

Better Auth operates as a backend authentication service that integrates with your application through a simple API. Here’s an overview of its architecture:

Core Components:

• Authentication Providers: Support for various authentication methods, including email/password, OAuth providers (Google, GitHub, etc.), and custom plugins.
• Session Management: Handles user sessions, including creation, expiration, and revocation.
• Database Integration: Utilizes databases like PostgreSQL, MySQL, or SQLite to store user data and session information.
• Plugin System: Allows for the extension of authentication functionalities through custom plugins.
• Rate Limiting: Built-in rate limiter to prevent abuse and ensure fair usage.
• Security Features: Includes features like 2FA, secure password hashing, and protection against common vulnerabilities.

Data Flow:

1. User Initiates Authentication: The user attempts to log in through the application interface.
2. Authentication Request: The application sends an authentication request to the Better Auth service.
3. Credential Verification: Better Auth verifies the provided credentials against the configured authentication providers.
4. Session Creation: Upon successful authentication, Better Auth creates a session and returns a session token to the application.
5. Access Granted: The application uses the session token to grant the user access to protected resources.
6. Session Management: Better Auth manages the session lifecycle, including expiration and revocation.

Basic Workflow of Better Auth

1. Installation: Install the Better Auth package using npm or yarn. npm install better-auth
2. Configuration: Create an auth.ts file and configure Better Auth with your desired authentication methods and database connection. import { betterAuth } from "better-auth"; export const auth = betterAuth({ database: new Pool({ connectionString: DATABASE_URL, }), emailAndPassword: { enabled: true, }, plugins: [ organization(), twoFactor(), ], });
3. Session Management: Use the provided API to manage user sessions, including login, logout, and session validation. const session = await auth.login({ email, password });
4. Access Control: Implement access control mechanisms to restrict access to certain resources based on user roles or permissions.
5. Extend Functionality: Utilize the plugin system to add custom authentication features as needed.

Step-by-Step Getting Started Guide for Better Auth

1. Install Better Auth

Install the Better Auth package in your project:

npm install better-auth

2. Set Up Database

Configure your database connection. Better Auth supports PostgreSQL, MySQL, and SQLite. For example, using PostgreSQL:

import { Pool } from "pg";

const db = new Pool({
  connectionString: process.env.DATABASE_URL,
});

3. Configure Authentication

Create an auth.ts file and configure Better Auth with your desired authentication methods:

import { betterAuth } from "better-auth";

export const auth = betterAuth({
  database: db,
  emailAndPassword: {
    enabled: true,
  },
  socialProviders: {
    google: {
      clientId: process.env.GOOGLE_CLIENT_ID,
      clientSecret: process.env.GOOGLE_CLIENT_SECRET,
    },
  },
});

4. Implement Authentication Flows

Use the provided API to implement authentication flows in your application:

const session = await auth.login({ email, password });

5. Manage Sessions

Handle session management, including creation, validation, and expiration:

const user = await auth.getSession(sessionToken);

6. Extend Functionality with Plugins

Add custom functionality using the plugin system:

import { twoFactor } from "better-auth/plugins";

auth.use(twoFactor());

7. Deploy and Monitor

Deploy your application and monitor authentication activities using the provided tools and dashboards.

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