firebase-auth

# Firebase Authentication

**Status**: Production Ready
**Last Updated**: 2026-01-25
**Dependencies**: None (standalone skill)
**Latest Versions**: firebase@12.8.0, firebase-admin@13.6.0

---

## Quick Start (5 Minutes)

### 1. Enable Auth Providers in Firebase Console

1. Go to Firebase Console > Authentication > Sign-in method
2. Enable desired providers (Email/Password, Google, etc.)
3. Configure OAuth providers with client ID/secret

### 2. Initialize Firebase Auth (Client)

```typescript
// src/lib/firebase.ts
import { initializeApp } from 'firebase/app';
import { getAuth } from 'firebase/auth';

const firebaseConfig = {
  apiKey: process.env.NEXT_PUBLIC_FIREBASE_API_KEY,
  authDomain: process.env.NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN,
  projectId: process.env.NEXT_PUBLIC_FIREBASE_PROJECT_ID,
  // ... other config
};

const app = initializeApp(firebaseConfig);
export const auth = getAuth(app);
```

### 3. Initialize Firebase Admin (Server)

```typescript
// src/lib/firebase-admin.ts
import { initializeApp, cert, getApps } from 'firebase-admin/app';
import { getAuth } from 'firebase-admin/auth';

if (!getApps().length) {
  initializeApp({
    credential: cert({
      projectId: process.env.FIREBASE_PROJECT_ID,
      clientEmail: process.env.FIREBASE_CLIENT_EMAIL,
      privateKey: process.env.FIREBASE_PRIVATE_KEY?.replace(/\\n/g, '\n'),
    }),
  });
}

export const adminAuth = getAuth();
```

---

## Email/Password Authentication

### Sign Up

```typescript
import { createUserWithEmailAndPassword, sendEmailVerification, updateProfile } from 'firebase/auth';
import { auth } from './firebase';

async function signUp(email: string, password: string, displayName: string) {
  try {
    const userCredential = await createUserWithEmailAndPassword(auth, email, password);
    const user = userCredential.user;

    // Update display name
    await updateProfile(user, { displayName });

    // Send verification email
    await sendEmailVerification(user);

    return user;
  }