I am repeatedly encountering the Firebase error message stating that a Firebase App named '[DEFAULT]' already exists due to a duplicate app (app/duplicate-app)

import React, { Component } from 'react'
import './App.css';

import "bootstrap/dist/css/bootstrap.min.css";
import  firebase from 'firebase/app';
import 'firebase/database';
import ThreadDisplay from './ThreadDisplay/components/ThreadDisplay';

class google extends Component {
  constructor(props) {
    super(props);
    const config =
     {
      apiKey: "",
      authDomain: "",
      projectId: "",
      storageBucket: "",
      messagingSenderId: "",
      appId: "",
      measurementId: ""
    };
     this.app = firebase.initializeApp(config);
    
    this.database = this.app.database();
  }
  
  render() {
    return (
      <ThreadDisplay database={this.database} />
    );
  }
}
export default google;

I have encountered a recurring issue when initializing the Firebase app only once. The error message "Firebase: Firebase App named '[DEFAULT]' already exists (app/duplicate-app)" keeps popping up. Any suggestions on how to resolve this?

javascriptfirebasereact-nativewebreact-dom

Answer №1

In case you only have one instance of calling initializeApp here, it could mean that the component is being created multiple times.

If you are unable to locate a specific place where the function is definitely called only once, I often find it helpful to add an explicit check to see if Firebase has already been initialized like this:

if (firebase.apps.length === 0) {
    this.app = firebase.initializeApp(config);
    
    this.database = this.app.database();
}

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