Encountering an issue with Firebase authentication in Next.js: the window object is not defined

Question

Encountering an issue with Firebase authentication in Next.js: the window object is not defined

Here is some code snippets:

import { initializeApp } from "firebase/app";
import { getAnalytics } from "firebase/analytics";
import { getAuth } from "firebase/auth";

const firebaseConfig = {
  //credentials//
};
export const app = initializeApp(firebaseConfig);
export const analytics=getAnalytics(app)
export const authentication=getAuth(app);

Now, let's take a look at another piece of code:

export default function Home() {
  const auth = getAuth();
  const generateRecaptcha=()=>{
    
    window.recaptchaVerifier = new RecaptchaVerifier('recaptcha-container', {}, authentication);

  }
  window.recaptchaVerifier = new RecaptchaVerifier('recaptcha-container', {}, auth);
  const getOTP=()=>{
    generateRecaptcha()
  }

An error has been encountered:

ReferenceError: window is not defined

Even after removing export getAnyalytics, the same error persists but in the window.recaptchaVerifier function within index.js.

Could you also explain what getAnalytics is used for?

javascript firebase next.js firebase-authentication

Answer 1

Answer №1

getAnalytics() allows you to create a Firebase Analytics instance for logging events in your app.

To integrate analytics, I created a provider named FirebaseTrackingProvider.tsx:


export const FirebaseTrackingProvider = (props: {children: ReactNode}) => {
  const router = useRouter();
  const [analytics, setAnalytics] = useState(null);

  useEffect(() => {
    setAnalytics(getAnalytics(firebaseApp));
    if (analytics) {
      setAnalyticsCollectionEnabled(analytics, true);
    }

    const handleRouteChange = (url: string) => {
      if (!analytics) {
        return;
      }
      logEvent(analytics, 'page_view', {
        page_location: url,
        page_title: document?.title,
      });
      setCurrentScreen(analytics, document.title ?? 'Undefined');
    };

    router.events.on('routeChangeStart', handleRouteChange);

    return () => {
      router.events.off('routeChangeStart', handleRouteChange);
    };
  }, [analytics, router.events]);

  return <FirebaseContext.Provider value={analytics}>{props.children}</FirebaseContext.Provider>;
};

You can then use the analytics on different pages or components like this:

const analytics = useContext(FirebaseContext);

// Example usage in sign up flow

logEvent(analytics, 'sign_up', {
  uid: data.uid,
  email: data.email,
});

For the recaptcha error in NextJS, ensure window is defined before instantiating RecaptchaVerifier using if(window), or utilize a useEffect hook:

useEfect(() => {

  // This wont change on re renders
  let completed = false;

  if (!completed && window){
    // recaptca instantiation
    completed = true;
  }

}, [window])

Answer 2

getAnalytics() allows you to create a Firebase Analytics instance for logging events in your app.

To integrate analytics, I created a provider named FirebaseTrackingProvider.tsx:


export const FirebaseTrackingProvider = (props: {children: ReactNode}) => {
  const router = useRouter();
  const [analytics, setAnalytics] = useState(null);

  useEffect(() => {
    setAnalytics(getAnalytics(firebaseApp));
    if (analytics) {
      setAnalyticsCollectionEnabled(analytics, true);
    }

    const handleRouteChange = (url: string) => {
      if (!analytics) {
        return;
      }
      logEvent(analytics, 'page_view', {
        page_location: url,
        page_title: document?.title,
      });
      setCurrentScreen(analytics, document.title ?? 'Undefined');
    };

    router.events.on('routeChangeStart', handleRouteChange);

    return () => {
      router.events.off('routeChangeStart', handleRouteChange);
    };
  }, [analytics, router.events]);

  return <FirebaseContext.Provider value={analytics}>{props.children}</FirebaseContext.Provider>;
};

You can then use the analytics on different pages or components like this:

const analytics = useContext(FirebaseContext);

// Example usage in sign up flow

logEvent(analytics, 'sign_up', {
  uid: data.uid,
  email: data.email,
});

For the recaptcha error in NextJS, ensure window is defined before instantiating RecaptchaVerifier using if(window), or utilize a useEffect hook:

useEfect(() => {

  // This wont change on re renders
  let completed = false;

  if (!completed && window){
    // recaptca instantiation
    completed = true;
  }

}, [window])

Encountering an issue with Firebase authentication in Next.js: the window object is not defined

Answer №1

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