Firebase onAuthStateChanged is being called twice upon login

javascript reactjs firebase redux firebase-authentication

Solution 1:

Yes this is normal, onAuthStateChanged will keep triggering. You can prevent from multiple calls with this code:

var authFlag = true;
firebase.auth().onAuthStateChanged((res) => {
    if(res && authFlag) {
        console.log('Firebase - onAuthStateChanged', {res})
        authFlag = false;
        //rest of your code

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