firebase-auth-basics

Name: firebase-auth-basics
Author: firebase

byfirebase· 35 skills

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How to install firebase-auth-basics?

firebase/agent-skills/firebase-auth-basics

$npx -y skills add firebase/agent-skills --skill firebase-auth-basics

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Run `npx skills use "https://github.com/firebase/agent-skills" --skill "firebase/agent-skills/firebase-auth-basics"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.

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SKILL.md

1	## Prerequisites
2
3	- Firebase Project: Created via
4	`npx -y firebase-tools@latest projects:create` (see `firebase-basics`).
5	- Firebase CLI: Installed and logged in (see `firebase-basics`).
6
7	## Core Concepts
8
9	Firebase Authentication provides backend services, easy-to-use SDKs, and
10	ready-made UI libraries to authenticate users to your app.
11
12	### Users
13
14	A user is an entity that can sign in to your app. Each user is identified by a
15	unique ID (`uid`) which is guaranteed to be unique across all providers. User
16	properties include:
17
18	- `uid`: Unique identifier.
19	- `email`: User's email address (if available).
20	- `displayName`: User's display name (if available).
21	- `photoURL`: URL to user's photo (if available).
22	- `emailVerified`: Boolean indicating if the email is verified.
23
24	### Identity Providers
25
26	Firebase Auth supports multiple ways to sign in:
27
28	- Email/Password: Basic email and password authentication.
29	- Federated Identity Providers: Google, Facebook, Twitter, GitHub,
30	Microsoft, Apple, etc.
31	- Phone Number: SMS-based authentication.
32	- Anonymous: Temporary guest accounts that can be linked to permanent
33	accounts later.
34	- Custom Auth: Integrate with your existing auth system.
35
36	Google Sign In is recommended as a good and secure default provider.
37
38	### Tokens
39
40	When a user signs in, they receive an ID Token (JWT). This token is used to
41	identify the user when making requests to Firebase services (Realtime Database,
42	Cloud Storage, Firestore) or your own backend.
43
44	- ID Token: Short-lived (1 hour), verifies identity.
45	- Refresh Token: Long-lived, used to get new ID tokens.
46
47	## Workflow
48
49	### 1. Provisioning
50
51	#### Option 1. Enabling Authentication via CLI
52
53	Only Google Sign In, anonymous auth, and email/password auth can be enabled via
54	CLI. For other providers, use the Firebase Console.
55
56	Configure Firebase Authentication in `firebase.json` by adding an 'auth' block:
57
58	```
59	{
60	"auth": {
61	"providers": {
62	"anonymous": true,
63	"emailPassword": true,
64	"googleSignIn": {
65	"oAuthBrandDisplayName": "Your Brand Name",
66	"supportEmail": "support@example.com",
67	"authorizedRedirectUris": ["https://example.com", "http://localhost"]
68	}
69	}
70	}
71	}
72	```
73
74	> [!NOTE] If the Google Sign-In popup opens and immediately closes with the
75	> error `[firebase_auth/unauthorized-domain]`, it means the domain is not
76	> authorized. For local development, ensure `localhost` is included in the
77	> Authorized Domains list in the Firebase Console or via the
78	> `authorizedDomains` field in `firebase.json`. CRITICAL: Do NOT include the
79	> protocol or port number in the Authorized Domains list (e.g., use `localhost`,
80	> NOT `http://localhost:9090`).
81
82	CRITICAL: After configuring `firebase.json`, you MUST deploy the auth
83	configuration to the Firebase backend for the changes to take effect. This is
84	essential for auth providers like Google Sign-In, email/password, etc. to
85	auto-generate the necessary OAuth clients for your app platforms. Run:
86
87	```bash
88	npx -y firebase-tools@latest deploy --only auth
89	```
90
91	#### Option 2. Enabling Authentication in Console
92
93	Enable other providers in the Firebase Console.
94
95	1. Go to the
96	https://console.firebase.google.com/project/_/authentication/providers
97	1. Select your project.
98	1. Enable the desired Sign-in providers (e.g., Email/Password, Google).
99
100	### 2. Client Setup & Usage
101
102	Web See [references/client_sdk_web.md](references/client_sdk_web.md).
103
104	Flutter See [references/flutter_setup.md](references/flutter_setup.md).
105	Android (Kotlin) See
106	[references/client_sdk_android.md](references/client_sdk_android.md).
107
108	### 3. Security Rules
109
110	Secure your data using `request.auth` in Firestore/Storage rules.
111
112	See [references/security_rules.md](references/security_rules.md).

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Run `npx skills use "https://github.com/firebase/agent-skills" --skill "firebase/agent-skills/firebase-auth-basics"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.

Use the skills in "https://github.com/firebase/agent-skills" that are relevant to the current task. Run `npx skills add "https://github.com/firebase/agent-skills"` and select the relevant skills, then follow their instructions.

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