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Auth.js

Auth.js

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Last Updated:10/26/2025
Pricing:
Free
Category:
Developer Authentication Frameworks
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What is Auth.js

Auth.js is a complete authentication solution that works across different JavaScript frameworks. It provides everything needed to add secure login systems to websites and applications. You can let users sign in through their existing accounts on services like Google or GitHub, or you can use email-based magic links, or even traditional username and password combinations.

The library is runtime agnostic, meaning it adapts to work with Next.js, SvelteKit, Express, Qwik, and other frameworks. It handles session management, protects routes, and connects to databases when needed. Auth.js follows web standards and security best practices, making it both safe and reliable. Since it is open source, the code is publicly available for review and contributions from developers worldwide.

Features of Auth.js

  • OAuth 2.0 and OpenID Connect support

  • 80+ pre-configured authentication providers

  • Magic link email authentication

  • Username and password credentials

  • WebAuthn passwordless login

  • Multiple framework support (Next.js, SvelteKit, Express)

  • Database adapters for major databases

  • JWT or database sessions

  • Built-in security features

  • Custom page support

  • TypeScript ready

  • Open source and free

Auth.js Pricing

Most Popular
Free / Open Source

Free

What's included:
  • Complete authentication solution
  • 80+ pre-configured OAuth providers
  • OAuth 2.0 and OpenID Connect support
  • Magic link email authentication
  • Credentials-based authentication
  • WebAuthn passwordless login
  • Multiple framework support
  • Database adapters (PostgreSQL, MySQL, MongoDB, etc.)
  • JWT or database sessions
  • Built-in security features (CSRF, PKCE)

Auth.js Use Cases

Auth.js Repository

View on Github
Stars28,315
Forks4,042
Repository Age8 years
Last Commit12 days ago

FAQ's About Auth.js

Is Auth.js really completely free?
Yes, Auth.js is completely free and open source under the ISC license. There are no subscription fees, usage limits, or hidden costs. All features including support for 80+ OAuth providers, database integrations, and advanced security features are available at no charge for both personal and commercial use.
What frameworks does Auth.js support?
Auth.js supports multiple JavaScript frameworks including Next.js, SvelteKit, Express, Qwik, and SolidStart. It is runtime agnostic and follows web standards, making it adaptable to different environments. Each framework has its own package with specific integration instructions in the documentation.
How is Auth.js different from other authentication libraries?
Auth.js stands out for being completely free and open source while offering comprehensive features. It supports 80+ OAuth providers out of the box, works across multiple frameworks, and provides flexibility in choosing between JWT or database sessions. Unlike paid services, you maintain full control over your authentication system and user data.
Can I use Auth.js without a database?
Yes, Auth.js can work without a database by using JWT-based sessions. This is perfect for stateless applications or when you want to minimize infrastructure. However, if you need to store user data, manage accounts, or implement features like refresh tokens, you can easily add database support using one of the available adapters.
What authentication methods does Auth.js support?
Auth.js supports four main authentication methods: OAuth authentication with providers like Google and GitHub, magic links sent via email, traditional credentials like username and password, and WebAuthn for passwordless authentication using biometrics or security keys. You can use one method or combine multiple methods in your application.
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