When calling `getAuth()`, an object is returned. However, upon reloading the page, the

Question

When calling `getAuth()`, an object is returned. However, upon reloading the page, the

My code is extensive, so I have only included a portion that I believe is crucial.

import {getAuth} from "firebase/auth"

const authFirebase = getAuth()
console.log(authFirebase)

const Home = () => {
  ...
  return(
   ...
  )
}

Every time I refresh the page (F5) if I just.

console.log(authFirebase)

When I retrieve an object containing uid in the currentUser property and code like this.

 console.log(authFirebase.currentUser.uid)

I encounter this error

TypeError: Cannot read properties of null (reading 'uid')

I am confused; there must be something about Firebase that I'm missing?

javascript firebase firebase-authentication

Answer 1

Answer №1

import { getAuth, onAuthStateChanged } from "firebase/auth";

const authentication = getAuth();
onAuthStateChanged(authentication, (user) => {
  if (user) {
    // User is logged in, check documentation for available properties
    // https://firebase.google.com/docs/reference/js/firebase.User
    const userID = user.uid;
    // ...
  } else {
    // User is logged out
    // ...
  }
});

Answer 2

import { getAuth, onAuthStateChanged } from "firebase/auth";

const authentication = getAuth();
onAuthStateChanged(authentication, (user) => {
  if (user) {
    // User is logged in, check documentation for available properties
    // https://firebase.google.com/docs/reference/js/firebase.User
    const userID = user.uid;
    // ...
  } else {
    // User is logged out
    // ...
  }
});

Answer 3

Answer №2

the issue arises when attempting to access the user object before it is fully loaded and ready for use.

To avoid this, consider adding a conditional check to ensure the object exists before logging to the console.

Another approach is to utilize an observer such as onAuthStateChanged, which can help prevent premature fetching of the object.

firebase.auth().onAuthStateChanged( user =>; {
  if (user) { console.log(user) }
});

Answer 4

the issue arises when attempting to access the user object before it is fully loaded and ready for use.

To avoid this, consider adding a conditional check to ensure the object exists before logging to the console.

Another approach is to utilize an observer such as onAuthStateChanged, which can help prevent premature fetching of the object.

firebase.auth().onAuthStateChanged( user =>; {
  if (user) { console.log(user) }
});

When calling `getAuth()`, an object is returned. However, upon reloading the page, the

Answer №1

Answer №2

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