better-auth

# Better Auth Skill Better Auth is comprehensive, framework-agnostic authentication/authorization framework for TypeScript with built-in email/password, social OAuth, and powerful plugin ecosystem for advanced features. ## When to Use - Implementing auth in TypeScript/JavaScript applications - Adding email/password or social OAuth authentication - Setting up 2FA, passkeys, magic links, advanced auth features - Building multi-tenant apps with organization support - Managing sessions and user lifecycle - Working with any framework (Next.js, Nuxt, SvelteKit, Remix, Astro, Hono, Express, etc.) ## Quick Start ### Installation ```bash npm install better-auth # or pnpm/yarn/bun add better-auth ``` ### Environment Setup Create `.env`: ```env BETTER_AUTH_SECRET=<generated-secret-32-chars-min> BETTER_AUTH_URL=http://localhost:3000 ``` ### Basic Server Setup Create `auth.ts` (root, lib/, utils/, or under src/app/server/): ```ts import { betterAuth } from "better-auth"; export const auth = betterAuth({ database: { // See references/database-integration.md }, emailAndPassword: { enabled: true, autoSignIn: true }, socialProviders: { github: { clientId: process.env.GITHUB_CLIENT_ID!, clientSecret: process.env.GITHUB_CLIENT_SECRET!, } } }); ``` ### Database Schema ```bash npx @better-auth/cli generate # Generate schema/migrations npx @better-auth/cli migrate # Apply migrations (Kysely only) ``` ### Mount API Handler **Next.js App...