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Auth0 → Better Auth

medium

Better Auth is a self-hosted TypeScript-first auth library. Free, open-source, no MAU limits. Best for apps wanting full control without vendor lock-in.

Estimated: 4-8h · 6 steps
Progress0%
Step 1: Install Better Auth
npm install better-auth
Step 2: Set up the auth config

Create auth.ts at project root. Configure database adapter (Drizzle, Prisma, or Kysely), providers, and session settings.

import { betterAuth } from 'better-auth'
export const auth = betterAuth({ database: { provider: 'pg', url: process.env.DATABASE_URL }, emailAndPassword: { enabled: true } })
Step 3: Run migrations

Better Auth manages its own tables. Use the CLI to generate and run migrations.

npx better-auth migrate
Step 4: Add API route

Mount the Better Auth handler in your framework's catch-all route.

// Next.js app/api/auth/[...all]/route.ts
import { auth } from '@/auth'
export const { GET, POST } = auth.handler
Step 5: Migrate users

Export users from Auth0 Management API. Import to your database, hashing passwords with bcrypt or argon2 as configured.

Step 6: Update client code

Use the Better Auth React/Vue/Svelte client. Replace useUser, signIn, signOut hooks.

npm install better-auth/client
✓ Sign in/up/out work, sessions persist

What this migration involves

Moving from Auth0 to Better Auth is rated medium and takes about 4-8h on a typical project. The guide breaks it into 6 steps, 5 of which ship with runnable commands and 1 with a verification check. On pricing, Auth0 is freemium and Better Auth is open-source with a free plan to test the move.

Auth0 data →Better Auth data →

Related migrations

Auth0 → Clerk — easy, 2-4hClerk → Better Auth — medium, 4-8hNextAuth.js v4 → Auth.js v5 — medium, 2-4hFirebase Auth → Supabase Auth — medium, 4-8hNextAuth.js / Auth.js → Better Auth — medium, 3-6hSupabase Auth → Better Auth — medium, 4-8h

FAQ

How long does migrating from Auth0 to Better Auth take?

Around 4-8h for a typical project — 6 steps, difficulty rated medium, 5 of them with copy-paste commands.

Is moving from Auth0 to Better Auth reversible?

No reverse guide is tracked yet, so treat this as a one-way move and keep a full export of your Auth0 data before you start.

What does Better Auth cost compared to Auth0?

Auth0: freemium from $35/mo, free plan available. Better Auth: open-source from $0/mo, free plan available.