Error: The property 'initializeApp' cannot be read because it is undefined

Question

Error: The property 'initializeApp' cannot be read because it is undefined

Recently, I decided to integrate Firebase libraries into my Vue project by installing them using npm install firebase.

I then proceeded to add these Firebase libraries in my main.js file:

import { Firebase } from 'firebase/app'
import 'firebase/analytics'
import 'firebase/auth'
import 'firebase/messaging'

Firebase.initializeApp({
  apiKey: 'xxx',
  authDomain: 'xxx',
  databaseURL: 'xxx',
  projectId: 'xxx',
  storageBucket: 'xxx',
  messagingSenderId: 'xxx',
  appId: 'xxx',
  measurementId: 'xxx'
})

However, upon doing this setup, I encountered the following error:

Uncaught TypeError: Cannot read property 'initializeApp' of undefined

javascript firebase vue.js

Answer 1

Answer №1

Modify the following code snippet:

import { Firebase } from 'firebase/app'

to look like this:

import * as firebase from "firebase/app";

Import all content from firebase/app and then execute the following:

firebase.initializeApp({
  apiKey: 'xxx',
  authDomain: 'xxx',
  databaseURL: 'xxx',
  projectId: 'xxx',
  storageBucket: 'xxx',
  messagingSenderId: 'xxx',
  appId: 'xxx',
  measurementId: 'xxx'
})

Answer 2

Modify the following code snippet:

import { Firebase } from 'firebase/app'

to look like this:

import * as firebase from "firebase/app";

Import all content from firebase/app and then execute the following:

firebase.initializeApp({
  apiKey: 'xxx',
  authDomain: 'xxx',
  databaseURL: 'xxx',
  projectId: 'xxx',
  storageBucket: 'xxx',
  messagingSenderId: 'xxx',
  appId: 'xxx',
  measurementId: 'xxx'
})

Answer 3

Answer №2

If you are a newcomer to the latest Firebase Modular API (v9), you will need to refactor your code.

The imports should now look like this:

import { FirebaseApp, initializeApp } from "firebase/app";
import { getAuth } from "firebase/auth";
import { getDatabase } from "firebase/database";

const firebaseConfig = {...}

// Initialize Firebase
const app: FirebaseApp = initializeApp(firebaseConfig);

const db = getDatabase(app);

const auth = getAuth(app);

You can learn more about this new refactoring style here

For information on how data Read and Write processes have changed, check out this link

Answer 4

If you are a newcomer to the latest Firebase Modular API (v9), you will need to refactor your code.

The imports should now look like this:

import { FirebaseApp, initializeApp } from "firebase/app";
import { getAuth } from "firebase/auth";
import { getDatabase } from "firebase/database";

const firebaseConfig = {...}

// Initialize Firebase
const app: FirebaseApp = initializeApp(firebaseConfig);

const db = getDatabase(app);

const auth = getAuth(app);

You can learn more about this new refactoring style here

For information on how data Read and Write processes have changed, check out this link

Answer 5

Answer №3

To determine your Firebase version, open the package.json file and look for the version number. If it is 9 or higher, your code should resemble the following:

import { initializeApp } from "firebase/app";
import { getFirestore, collection, getDocs } from 'firebase/firestore/lite';
import { getAuth } from "firebase/auth";

After that, you need to set up your Firebase configuration in this format:

const firebaseConfig = {
  apiKey: "...",
  authDomain: "...",
  projectId: "...",
  storageBucket: "...",
  messagingSenderId: "...",
  appId: "...",
  measurementId: "...",
};

// Initializing Firebase
const firebase = initializeApp(firebaseConfig);
const db = getFirestore(firebase);
const auth = getAuth(firebase);

Answer 6

To determine your Firebase version, open the package.json file and look for the version number. If it is 9 or higher, your code should resemble the following:

import { initializeApp } from "firebase/app";
import { getFirestore, collection, getDocs } from 'firebase/firestore/lite';
import { getAuth } from "firebase/auth";

After that, you need to set up your Firebase configuration in this format:

const firebaseConfig = {
  apiKey: "...",
  authDomain: "...",
  projectId: "...",
  storageBucket: "...",
  messagingSenderId: "...",
  appId: "...",
  measurementId: "...",
};

// Initializing Firebase
const firebase = initializeApp(firebaseConfig);
const db = getFirestore(firebase);
const auth = getAuth(firebase);

Answer 7

Answer №4

An issue arises due to the discrepancy between the version you are using and the installed SDK version

To resolve this, make the following changes:

import { Firebase } from 'firebase/app'
import 'firebase/analytics'
import 'firebase/auth'
import 'firebase/messaging'

Update it to:

   import { Firebase } from 'firebase/compat/app'
   import 'firebase/compat/analytics'
   import 'firebase/compat/auth'
   import 'firebase/compat/messaging'

For more detailed information, refer to this SDK9 link

Answer 8

An issue arises due to the discrepancy between the version you are using and the installed SDK version

To resolve this, make the following changes:

import { Firebase } from 'firebase/app'
import 'firebase/analytics'
import 'firebase/auth'
import 'firebase/messaging'

Update it to:

   import { Firebase } from 'firebase/compat/app'
   import 'firebase/compat/analytics'
   import 'firebase/compat/auth'
   import 'firebase/compat/messaging'

For more detailed information, refer to this SDK9 link

Answer 9

Answer №5

Encountering a TypeError: Cannot read properties of undefined (reading 'initializeApp')

**Follow the steps outlined at** https://firebaseopensource.com/projects/rakannimer/react-firebase/

If you are still facing the same issue, it may be due to not installing the required sub packages.

Ensure to run npm i @react-firebase/database --force for installation.

**Snippet of Code**
// Import necessary functions from SDKs
import { initializeApp } from "firebase/app";

// Your Firebase configuration details
const firebaseConfig = {
    apiKey: "YOUR_API_KEY",
    authDomain: "YOUR_DOMAIN_KEY",
    databaseURL: "YOUR_DATABASE_URL",
    projectId: "YOUR_PROJECT_ID",
    storageBucket: "YOUR_STORAGE_BUCKET",
    messagingSenderId: "YOUR_MESSAGING_SENDER_ID",
    appId: "YOUR_APP_ID",
    measurementId: "YOUR_MEASUREMENT_ID"
};

// Initialize Firebase
const app = initializeApp(firebaseConfig);

Answer 10

Encountering a TypeError: Cannot read properties of undefined (reading 'initializeApp')

**Follow the steps outlined at** https://firebaseopensource.com/projects/rakannimer/react-firebase/

If you are still facing the same issue, it may be due to not installing the required sub packages.

Ensure to run npm i @react-firebase/database --force for installation.

**Snippet of Code**
// Import necessary functions from SDKs
import { initializeApp } from "firebase/app";

// Your Firebase configuration details
const firebaseConfig = {
    apiKey: "YOUR_API_KEY",
    authDomain: "YOUR_DOMAIN_KEY",
    databaseURL: "YOUR_DATABASE_URL",
    projectId: "YOUR_PROJECT_ID",
    storageBucket: "YOUR_STORAGE_BUCKET",
    messagingSenderId: "YOUR_MESSAGING_SENDER_ID",
    appId: "YOUR_APP_ID",
    measurementId: "YOUR_MEASUREMENT_ID"
};

// Initialize Firebase
const app = initializeApp(firebaseConfig);

Error: The property 'initializeApp' cannot be read because it is undefined

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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