Initialization

config object

The config object allows the client to identify itself when talking to the Firebase services.

const firebaseConfig = {
    apiKey: "....",
    authDomain: ".....firebaseapp.com",
    projectId: "....",
    storageBucket: ".....appspot.com",
    messagingSenderId: "....",
    appId: "....",
}

the app object

we get and keep a reference to the app object to provide it to services such as auth or firestore.

embed the config in the app object

On the client, we provide the config to the app object , through initializeApp().

const app = initializeApp(firebaseConfig)

cloud functions: pre-configured

On a server managed by Google, the admin SDK is automatically configured, so that we don't need to give the config to the app.

const app = initializeApp() // on google server