firebase-auth-basics

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:

• uid: Unique identifier.
• email: User's email address (if available).
• displayName: User's display name (if available).
• photoURL: URL to user's photo (if available).
• emailVerified: Boolean indicating if the email is verified.