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Firebase + React auth not working with my .env

So i've read many topics and lose so much time cause of this issue.
My components don't load anymore and i'm receiving this error in my console : 'FirebaseError: Firebase: Error (auth/invalid-api-key).'
(I specify that is my first project using firebase).
About my firebase.config.js :
import firebase from 'firebase/compat/app';
import 'firebase/compat/auth';
const app = firebase.initializeApp({
apiKey: process.env.REACT_APP_API_KEY,
authDomain: process.env.REACT_APP_AUTH_DOMAIN,
projectId: process.env.REACT_APP_PROJECT_ID,
storageBucket: process.env.REACT_APP_STORAGE_BUCKET,
messagingSenderId: process.env.REACT_APP_MESSAGING_SENDER_ID,
appId: process.env.REACT_APP_MESSAGING_APP_ID
});
export const auth = app.auth();
export default app;
About my .env.local :
REACT_APP_API_KEY=AIXXXXzaSyX_ITiQXXXXXXXXxcXXXXXXXxU
REACT_APP_AUTH_DOMAIN=XXXXX.firebaseapp.com
REACT_APP_PROJECT_ID=name-name-name
REACT_APP_STORAGE_BUCKET=name-name-name.appspot.com
REACT_APP_MESSAGING_SENDER_ID=5XXX7XXXX5XX
REACT_APP_MESSAGING_APP_ID=1:5XXXX4XXX7X:web:aXXXXxxx0xxxxb4a4xxxxxxdd
**About files location : **
src/utils/firebase.config.js
src/.env.local
About the auth process :
Authentication is used in a signUp component that matches a form
Thanks for reading
When I just paste the API_KEY directly in app like this : apiKey: "string". This works, so I think this issue come from my .env file.

I think you're using create-react-app. If that is the case you need to add the .env file to the root of your project, not the src folder.
See the docs for more info on env vars in create react app https://create-react-app.dev/docs/adding-custom-environment-variables/#adding-development-environment-variables-in-env

Having error attempting to use RTDB in Expo managed

I'm attempting to use firebase realtime database on my app. I first authenticate and then I need to use the RTDB. Here is my attempt.
import { initializeApp } from 'firebase/app';
import 'firebase/auth';
import 'firebase/storage';
import { getDatabase } from "firebase/database";
import getEnvVars from '../environment';
const ENV = getEnvVars();
const firebaseConfig = {
apiKey: ENV.firebase.API_KEY,
authDomain: ENV.firebase.AUTH_DOMAIN,
databaseURL: ENV.firebase.DATABASE_URL,
projectId: ENV.firebase.PROJECT_ID,
storageBucket: ENV.firebase.STORAGE_BUCKET,
messagingSenderId: ENV.firebase.MESSAGING_SENDER_ID,
appId: ENV.firebase.APP_ID
};
initializeApp(firebaseConfig);
export const db = getDatabase();
The error I get is:
TypeError: (0, _database.getDatabase) is not a function. (In '(0, _database.getDatabase)()', '(0, _database.getDatabase)' is undefined)

You're mixing up the old, namespaced syntax of SDK versions 8 and lower, with the new, modular syntax of SDK versions 9 and above.
To get the database in v9, you call getDatabase() as a top-level function:
export const db = getDatabase();
I recommend keeping the Firebase documentation ready when going through this, as it has code samples for both the old and new syntax so you can easily compare. For this specific call, see the documentation on getting a database reference.

./src/Firebase.js Module not found: Can't resolve 'firebase' in 'C:\Users\HP\Desktop\React\clones\disney-plus-clone\src'

I am working on a react project and I need firebase for authentication I have installed firebase using "npm i firebase" & firebase-tools using "npm i firebase-tools" also the path is correct. There is no problem in defining the path. Everything from my side is correct then also it is showing the above error.
--- Please help -----

Why this is happening?
If you give a look at firebase package version(inside package.json) then it's version 9. Now firebase has added a new compatibility option so can use the /compat folder in your imports.
I have made some changes in Firebase.js file please replace your code
with the given below and then start your dev server.
import firebase from "firebase/compat/app"
import "firebase/compat/auth"
import "firebase/compat/firestore"
import "firebase/compat/storage"
const firebaseConfig = {
apiKey: "AIzaSyA9BnlX96fMf7XiUVCFRsoQzG8DGERJkeY",
authDomain: "disneyplus-clone-a33d5.firebaseapp.com",
projectId: "disneyplus-clone-a33d5",
storageBucket: "disneyplus-clone-a33d5.appspot.com",
messagingSenderId: "37918794208",
appId: "1:37918794208:web:dbe9842dfe1dda522a4b85",
measurementId: "G-DRVLJKWRWG",
};
firebase.initializeApp(firebaseConfig);
const db = firebase.firestore();
const auth = firebase.auth();
const provider = new firebase.auth.GoogleAuthProvider();
const storage =firebase.storage();
export { auth,provider,storage};
export default db;

How do I fix this error TypeError: _components_firebase_Firebase__WEBPACK_IMPORTED_MODULE_2__.default.auth is not a function

I am using Firebase with next.js and I have the files set up like below. I am trying to use the firebase client side sdk but it does not seem to be working on the sign up.
Firebase.js where the firebase app is initialized
import firebase from 'firebase/app'
import 'firebase/auth'
const config = {
apiKey: process.env.FIREBASE_API_KEY,
authDomain: process.env.FIREBASE_AUTH_DOMAIN,
databaseURL: process.env.FIREBASE_DATABASE_URL,
projectId: process.env.FIREBASE_PROJECT_ID,
storageBucket: process.env.FIREBASE_STORAGE_BUCKET,
messagingSenderId: process.env.FIREBASE_MESSAGING_SENDER_ID,
appId: process.env.FIREBASE_APP_ID,
measurementId: process.env.FIREBASE_MEASUREMENT_ID
};
export default function initFirebase() {
if (!firebase.apps.length) {
firebase.initializeApp(config)
}
}
The function which is erroring on the sign up paenter code herege.
import Firebase from "../../components/firebase/Firebase";
Firebase.auth().createUserWithEmailAndPassword(email, password).catch(function(error) {
// Handle Errors here.
});

You didn't export anything from Firebase.js called auth. That's what the error message is trying to tell you. If you don't export it, you can't access it after an import.
If you want to access the auth() function from the global firebase namespace, consider exporting it:
export function auth() {
return firebase.auth();
}
Then you can import it in another source file:
import { auth } from "../../components/firebase/Firebase";
auth().createUserWithEmailAndPassword(...);
In general, you should avoid using default exports as you're using now. It's far better to name each export individually. You can also consider exporting the entire firebase namespace if you want to expose the entire SDK.

I think the issue with your Firebase.js module is that you're exporting your initFirebase function rather than firebase itself.
Try changing that bottom section to:
if (!firebase.apps.length) {
firebase.initializeApp(config)
}
export default firebase;
P.S. When I first saw your post, I was hung up on a seemingly similar problem of my own causing me to overlook this export issue when I made my comments. I should have caught this export issue earlier. This is my lesson to myself about not jumping to conclusions.

Cannot resolve module "firebase" from 'firebase.js' : Firebase could not be found within the project

I'm having issues getting firebase into this project and I'm really not sure what is going wrong? All the firebase code (except the project-specific config code) is exactly the same as another (working) project...
I'm Using react-native with expo and have the FB database as a web project.
I Initialize the database in a file called firebase.js on the root level of the project, it's sitting right next to app.js. Database doesn't have security rules yet so I removed some of the info but its what you would expect for an api key.
import * as firebase from 'firebase';
import 'firebase/firestore';
const firebaseConfig = {
apiKey: "removed for post",
authDomain: "removed for post",
databaseURL: "removed for post",
projectId: "goalsdev-7eb67",
storageBucket: "goalsdev-7eb67.appspot.com",
messagingSenderId: "362368452051",
appId: "removed for post",
measurementId: "G-CNRGY3FTLE"
};
firebase.initializeApp(firebaseConfig);
export default firebase;
Then I try and use it like so...
import firebase from 'firebase'
this is in /screens/signUpFinal, have also tried importing as 'firebase.js', '../firebase' and '../firebase.js'
package.json is:
...
"dependencies": {
"#react-native-community/masked-view": "0.1.10",
"#react-native-firebase/app": "^8.4.3",
"#react-native-firebase/auth": "^9.2.3",
...
...

First run
npm install --save firebase
And instead of this:
import * as firebase from "firebase"
Use this:
import * as firebase from "firebase/app";
Source: https://firebase.google.com/docs/web/setup#node.js-apps
And also this:
import firebase from 'firebase'
To this:
import firebase from '../firebase'
And remove #react-native-firebase libraries because they won't work with expo.

I found that this is the best/easiest way to use in React.js with no problem ....you can try to import like this ( "firebase": "^9.6.1",) :
import firebase from 'firebase/compat/app';
import 'firebase/compat/auth';
import 'firebase/compat/firestore';
create your configfile .....
const firebaseConfig = { your config data ...};
and then you can use it in this way without any annoying error :
const firebaseApp = firebase.initializeApp(firebaseConfig);
const db = firebaseApp.firestore();
const auth = firebase.auth();
const provider = new firebase.auth.GoogleAuthProvider();
I hope it can help for others who have the same problem I had

The last time I had to install firebase was over 6 months ago and that was "firebase": "^8.6.2". The configuration looked something like;
import firebase from 'firebase/app';
import 'firebase/auth';
import 'firebase/firestore';
import 'firebase/storage';
import 'firebase/messaging';
import 'firebase/analytics';
import {
API_KEY,
AUTH_DOMAIN,
DATABASE_URL,
PROJECT_ID,
STORAGE_BUCKET,
MESSAGING_SENDER_ID,
APP_ID,
MEASUREMENT_ID,
MESSAGING_VAPID_KEY,
} from '../config';
const config = {
apiKey: API_KEY,
authDomain: AUTH_DOMAIN,
databaseURL: DATABASE_URL,
projectId: PROJECT_ID,
storageBucket: STORAGE_BUCKET,
messagingSenderId: MESSAGING_SENDER_ID,
appId: APP_ID,
measurementId: MEASUREMENT_ID,
};
// Initialize Firebase App with Configurations
firebase.initializeApp(config);
// Setup Firestore
const analytics = firebase.analytics();
const database = firebase.firestore();
const storage = firebase.storage();
// Setup push messaging
let messaging = null;
if (firebase.messaging.isSupported()) {
messaging = firebase.messaging();
messaging.usePublicVapidKey(MESSAGING_VAPID_KEY);
}
export {
firebase, storage, messaging, analytics, config, database as default,
};
As of the time of posting this, firebase is at v9 and a lot has changed. Kindly refer to the official doc here
for help with setting up firebase on a project.

Google has updated Firebase from version 8 to modular Web SDK. For this reason if you are using firebase#>9.0.0 then it will be a bit different.
In the firebase.js file you need to import firebase like this.
import firebase from "firebase/compat/app";
So a sample of your firebase.js will look like this
import firebase from "firebase/compat/app";
import { FIREBASE_CONFIG } from "./constants/firebase";
import "firebase/compat/storage";
firebase.initializeApp(FIREBASE_CONFIG);
export const storage = firebase.storage();
export default firebase;
Here FIREBASE_CONFIG is your firebase configuration
As shown in the example use this storage object in other files.
As here I used this storage to other functions and worked on its functionalities like upload files etc.
I haven't tried with other services like authentication but at least firebase-storage service worked for me

cd src from project file inside src do npm install firebase,I was facing same issue, but this solution sorted my problem.