Firebase setup (@react-native-firebase) in React Native

Introduction

Firebase helps your app store data and authenticate users easily. Setting it up connects your app to Firebase services.

You want to save user data like profiles or messages.

You need to let users sign in with email or social accounts.

You want to add push notifications to your app.

You want to track app usage and errors automatically.

Syntax

React Native

npm install --save @react-native-firebase/app

// For example, to add authentication:
npm install --save @react-native-firebase/auth

// Then link native code (if needed):
npx pod-install

Use npm or yarn to install Firebase packages.

Run npx pod-install after installing packages to update iOS dependencies.

Examples

Installs the core Firebase package needed for all Firebase features.

React Native

npm install --save @react-native-firebase/app

Installs Firestore to use Firebase's cloud database.

React Native

npm install --save @react-native-firebase/firestore

Updates iOS native dependencies after installing Firebase packages.

React Native

npx pod-install

Sample App

This simple app shows the Firebase app name to confirm Firebase is set up correctly.

React Native

import React from 'react';
import {Text, View} from 'react-native';
import firebase from '@react-native-firebase/app';

export default function App() {
  const appName = firebase.app().name;
  return (
    <View style={{flex:1, justifyContent:'center', alignItems:'center'}}>
      <Text>Firebase App Name: {appName}</Text>
    </View>
  );
}

Important Notes

Make sure to add your google-services.json (Android) and GoogleService-Info.plist (iOS) files to your project.

Always run npx pod-install after adding new Firebase packages for iOS.

Check Firebase console to create your project and download config files.

Summary

Install @react-native-firebase/app to start using Firebase.

Add specific Firebase packages like @react-native-firebase/auth as needed.

Include config files and run pod install for iOS to complete setup.

Practice

1. What is the first package you should install to start using Firebase in a React Native app with @react-native-firebase?

easy

A. Install @react-native-firebase/firestore

B. Install @react-native-firebase/app

C. Install @react-native-firebase/database

D. Install @react-native-firebase/auth

Solution

1. Step 1: Understand Firebase core setup

   The core Firebase package @react-native-firebase/app is required first to initialize Firebase in the app.

2. Step 2: Identify specific packages

   Other packages like auth, database, or firestore are added later depending on features needed.

3. Final Answer:

   Install @react-native-firebase/app -> Option B

4. Quick Check:

   Core Firebase package = @react-native-firebase/app [OK]

Hint: Always start with the core Firebase app package first [OK]

Common Mistakes:

• Installing feature packages before the core app package
• Confusing auth package as the first step
• Skipping the core package installation

2. Which command correctly installs the Firebase core package in a React Native project?

easy

A. npm install react-native-firebase

B. npm install firebase

C. npm install @react-native-firebase/app

D. npm install @firebase/app

Solution

1. Step 1: Identify the correct package name

   The official Firebase core package for React Native is @react-native-firebase/app.

2. Step 2: Match the correct npm install command

   The command to install it is npm install @react-native-firebase/app.

3. Final Answer:

   npm install @react-native-firebase/app -> Option C

4. Quick Check:

   Correct package install command = npm install @react-native-firebase/app [OK]

Hint: Use exact package name with @react-native-firebase prefix [OK]

Common Mistakes:

• Using 'firebase' instead of '@react-native-firebase/app'
• Missing the '@' symbol in package name
• Installing unrelated packages

3. Given this React Native code snippet, what will be the output when Firebase is correctly initialized?

import firebase from '@react-native-firebase/app';

console.log(firebase.app().name);

medium

A. [DEFAULT]

B. undefined

C. null

D. firebase

Solution

1. Step 1: Understand firebase.app() method

   The firebase.app() method returns the default Firebase app instance.

2. Step 2: Check the default app name

   The default app instance has the name "[DEFAULT]" unless otherwise configured.

3. Final Answer:

   [DEFAULT] -> Option A

4. Quick Check:

   firebase.app().name = [DEFAULT] [OK]

Hint: Default Firebase app name is always '[DEFAULT]' unless changed [OK]

Common Mistakes:

• Expecting undefined or null instead of '[DEFAULT]'
• Confusing app name with package name
• Assuming firebase.app() returns a config object

4. You installed @react-native-firebase/app and added your GoogleService-Info.plist file for iOS, but Firebase still doesn't initialize. What is the most likely missing step?

medium

A. Running pod install inside the ios directory

B. Running npm install again

C. Restarting the React Native packager

D. Adding firebase.json file

Solution

1. Step 1: Recognize iOS native dependency linking

   After adding Firebase config files on iOS, you must run pod install to link native modules.

2. Step 2: Understand why pod install is needed

   This installs CocoaPods dependencies required for Firebase to work on iOS.

3. Final Answer:

   Running pod install inside the ios directory -> Option A

4. Quick Check:

   iOS native linking requires pod install [OK]

Hint: Always run pod install after adding iOS Firebase config [OK]

Common Mistakes:

• Forgetting to run pod install after adding plist
• Assuming npm install is enough for iOS native modules
• Not restarting Xcode or build after changes

5. You want to add Firebase Authentication to your React Native app using @react-native-firebase. Which steps must you follow to set it up correctly?

hard

A. Install @react-native-firebase/app and @react-native-firebase/auth, no need for config files

B. Only install @react-native-firebase/auth and start using it directly

C. Add config files and run pod install, no need to install auth package

D. Install @react-native-firebase/app and @react-native-firebase/auth, add config files, run pod install (iOS), then import and use auth module

Solution

1. Step 1: Install required packages

   You must install both @react-native-firebase/app (core) and @react-native-firebase/auth (auth feature).

2. Step 2: Add platform config files and run pod install

   Include GoogleService-Info.plist for iOS and google-services.json for Android, then run pod install on iOS.

3. Step 3: Import and use the auth module in your code

   After setup, import auth from @react-native-firebase/auth and use its methods.

4. Final Answer:

   Install @react-native-firebase/app and @react-native-firebase/auth, add config files, run pod install (iOS), then import and use auth module -> Option D

5. Quick Check:

   Full Firebase auth setup = install + config + pod install + import [OK]

Hint: Install core and auth packages, add configs, run pod install [OK]

Common Mistakes:

• Skipping config files after installing auth package
• Not running pod install on iOS
• Trying to use auth without installing its package