Prerequisites

Firebase Project: Created via npx -y firebase-tools@latest projects:create (see firebase-basics).
Firebase CLI: Installed and logged in (see firebase-basics).

Core Concepts

Firebase Authentication provides backend services, easy-to-use SDKs, and ready-made UI libraries to authenticate users to your app.

Users

A user is an entity that can sign in to your app. Each user is identified by a unique ID (uid) which is guaranteed to be unique across all providers. User properties include:

Installs

1.1K

Repository

firebase/skills

GitHub Stars

360

First Seen

Feb 11, 2026

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