Open Source Firebase Authentication Alternative

Why choose an open-source Firebase Authentication alternative

Firebase Authentication stores user credentials and session data inside Google's platform, which means migrating away later requires exporting and re-importing an entire user base, password hashes included, through a limited export process. Self-hosting authentication keeps that data on infrastructure a team controls from the start and avoids being tied to Firebase's broader product and pricing decisions, including changes to Google Cloud billing that affect the whole Firebase suite.

What to look for

An authentication alternative needs session management with secure token rotation, social login, passwordless or email/password flows, and multi-factor authentication, plus SDKs that match the frontend and backend stack already in use. Self-hosted auth also needs a clear path for user management and a dashboard for support staff to look up accounts without touching the database directly, along with rate limiting to prevent credential-stuffing attacks.

SuperTokens as a Firebase Authentication alternative

SuperTokens is an open source authentication solution with a self-hosted core service and SDKs for backend frameworks including Node.js, Python, and Go, and frontend frameworks including React, Next.js, and vanilla JavaScript. It handles session management, email/password and passwordless login, social and enterprise SSO providers, and multi-factor authentication, with a management dashboard for looking up and editing user accounts. Because the core service runs on a team's own infrastructure, user data does not live inside a third-party identity platform, and role-based access control can be layered on top of sessions without vendor-specific rules. A managed cloud option exists for teams that want SuperTokens' auth logic without operating the service themselves. Its architecture separates the auth core from application code, so upgrading auth logic does not require redeploying the rest of the product, and pre-built UI components for login and signup forms are available for teams that do not want to build them from scratch.