Authorizer

Authorizer is an open-source authentication and authorization service that lets developers deploy their own user management system quickly. It handles user sign-ups, logins, password management, and session security while giving you complete control over your user data. The service supports multiple authentication methods including social logins (Google, GitHub, Microsoft), email/password, magic links, and multi-factor authentication via email OTP.

What sets Authorizer apart is its database flexibility—it works with 11+ databases including MongoDB, PostgreSQL, MySQL, and SQLite, so you can keep user data in your preferred storage system. It provides OAuth2 and OpenID compatible APIs, role-based access control, and secure session management with HTTP-only cookies. The service includes a built-in universal login page but also offers SDKs for custom UI implementations in JavaScript and React.

This tool is ideal for developers building web applications who want to avoid building authentication from scratch or relying on expensive third-party services. It's particularly useful for startups and small teams that need enterprise-grade security features without the complexity. Real-world use cases include adding secure user authentication to SaaS products, implementing role-based permissions for internal tools, and creating custom login flows for client applications.