A JavaScript library providing customizable UI components for Firebase authentication across React, Angular, and Shadcn.
FirebaseUI is an open-source JavaScript library that provides ready-to-use, customizable UI components for Firebase authentication. It simplifies adding secure sign-in flows—including email/password, OAuth, phone auth, and multi-factor authentication—to web applications built with React, Angular, or Shadcn, reducing boilerplate code and enforcing best practices.
Web developers using Firebase for authentication who want to quickly implement production-ready sign-in interfaces without building UI from scratch, particularly those working with React, Angular, or Shadcn-based projects.
It saves significant development time by offering pre-built, accessible, and themable components that handle complex Firebase auth flows, while providing flexibility through behaviors and a framework-agnostic core for custom implementations.
FirebaseUI is an open-source JavaScript library for Web that provides simple, customizable UI bindings on top of Firebase SDKs to eliminate boilerplate code and promote best practices.
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Supports all major Firebase authentication methods including email/password, OAuth, phone auth, MFA, and anonymous login, with dedicated components for each flow as listed in the reference API.
Offers first-party packages for React, Angular, and Shadcn UI, with a framework-agnostic core (@firebase-oss/ui-core) for custom implementations, reducing framework lock-in.
Provides configurable logic via behaviors like auto anonymous login, anonymous user upgrades, and reCAPTCHA settings, allowing fine-tuned control over auth scenarios without boilerplate code.
Enforces secure Firebase authentication patterns out of the box, such as proper handling of MFA enrollments and OAuth redirects, as detailed in the behaviors section.
Version 7 is a complete rewrite currently in beta, requiring a dedicated migration guide from v6 and potentially introducing breaking changes or instability for early adopters.
Only provides English (en-US) translations by default, forcing developers to manually register locales for other languages using the registerLocale function, which adds overhead for international apps.
Integration steps vary significantly per framework (e.g., Shadcn requires registry edits, Angular needs AngularFire), making setup more involved than a drop-in solution.