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Auth.js

Authentication for the Web. Free and open source.

★ 4.5

Open-source authentication library for Next.js, SvelteKit, and other frameworks. Formerly NextAuth.js. Self-hostable with full control over your auth flow.

Features

✓ 100% free and open source
✓ Self-hostable - full data control
✓ 50+ OAuth providers supported
✓ Email/passwordless authentication
✓ Database adapters (Prisma, Drizzle, etc.)
✓ JWT or database sessions
✓ Edge Runtime compatible
✓ TypeScript first

Pros

  • + Completely free - no per-user costs
  • + Full control over data and auth flow
  • + Huge provider ecosystem (50+ OAuth)
  • + Active open-source community
  • + No vendor lock-in

Cons

  • − More setup than managed services
  • − No built-in UI components
  • − Self-managed infrastructure
  • − No dedicated support (community only)