Better Auth

Package

Open-source TypeScript authentication framework with a plugin system

Price: Free, open source; paid cloud plans
Access: None, runs in your app

About

MIT-licensed TypeScript auth library that runs inside your own server and database, with email and password, social sign-on and plugins for 2FA, passkeys, organizations and SSO. The optional paid Better Auth Infrastructure adds a dashboard, audit logs and abuse protection.

What you can do with it

Add email and password and social sign-in to a Next.js, Nuxt or SvelteKit app
Keep users and sessions in your own Postgres, MySQL, SQLite or MongoDB database
Add 2FA, passkeys, organizations and SAML SSO through plugins

Get started

Run npm install better-auth
Set BETTER_AUTH_SECRET and BETTER_AUTH_URL in your .env file
Run npx auth@latest migrate to create the database tables

Example

// auth.ts
import { betterAuth } from "better-auth";
import Database from "better-sqlite3";

export const auth = betterAuth({
  database: new Database("./sqlite.db"),
  emailAndPassword: { enabled: true },
});
// Mount auth.handler on /api/auth/*, e.g. toNextJsHandler(auth) in Next.js

Details

Hosting: Self-hosted, Runs locally
Available in: Worldwide
Official SDKs: JavaScript/TypeScript
MCP server: None
Works with: Postgres, MySQL, MongoDB