Overview
Auth.js is a free and open source authentication solution designed for web applications. It provides built-in support for multiple authentication providers including OAuth (GitHub and others) and integrates seamlessly with popular frameworks like Next.js, SvelteKit, Express, and Qwik.
The library simplifies authentication setup with minimal configuration, allowing developers to add secure authentication to their applications quickly. It supports custom sign-in pages and flexible OAuth provider configuration, making it suitable for projects of varying complexity.
Key features
- Multiple OAuth providers
- Framework-agnostic support
- Custom sign-in pages
- Built-in provider configuration
- Open source
- Free to use
Pros
- Free and open source
- Supports multiple frameworks
- Easy OAuth setup
- Minimal configuration required
- Active community support
Cons
- Project now part of Better Auth (potential transition period)
- Documentation may be in flux during transition
Use this if
You need straightforward authentication for web applications, want to integrate OAuth providers, or are building with Next.js, SvelteKit, Express, or Qwik.
Skip this if
You require enterprise support, managed authentication services, or advanced features beyond standard OAuth integration.
Best for
Web application authenticationNext.js projectsSvelteKit applicationsExpress serversQwik appsOAuth integration
Alternatives
NextAuth.jsAuth0ClerkSupabase AuthFirebase Authentication
More Auth
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Better Auth
TypeScript authentication framework with plugins for sessions, OAuth, and passkeys.
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Keycloak
Open-source identity broker with SSO, OIDC, SAML, and user federation for enterprises.
