Firebase auth check if user exists openSignInFlow( "microsoft. Note that Firebase Auth web sessions are single host origin and will be persisted for a single domain only. The problem I am facing is On implementing reset password functionality users receiving emails even though they are not a registered user in Firebase. 13. Thanks for helping. I want to check if user already exist by phone number in Authentication t Feb 5, 2021 · I want to check if the email already exists in firebase authentication before the user clicks on sign up button if there is a way. My problem is that I want to first ask for the email, check that the format is valid, and then send the user to a LogIn screen or SignIn screen depending on whether the email already exists on Firebase. super. Try Teams for free Explore Teams Jun 4, 2018 · In Firebase I need to check if a Facebook user exists without creating the user. The solution is here: DatabaseReference rootRef = FirebaseDatabase. firebase:firebase-bom:33. You need to know that in at most an hour, Firebase Authentication will try to refresh the access token for that particular user that was disabled or deleted. See Manage Users. But also has to use the Firebase database to create a Dummy user table for checking. Jan 23, 2023 · Note that this API gives malicious users a way to perform a so-called enumeration attack, so you can actually nowadays disable fetchSignInMethodsForEmail - in which case calling it from your app would fail. If the array it returns is empty, the email isn't used by any user yet. May 3, 2020 · Ask questions, find answers and collaborate at work with Stack Overflow for Teams. I could have sworn I once saw a document describing a method or some way of checking if a user account in firebase auth is also an administrator of the firebase project. uid) ref. js const { above one is working for username or email or phone only check to find the user already exit or not, but how to i compare the more than one user at a same time to find the user exit or not. Now when the game starts, I wanna check if the user logged-in i Feb 11, 2020 · You'll want to attach the database listener inside the auth state changed listener, so that it only runs once the user is authenticated:. I know the easy way to do it is to catch the exception when using the createUserWithEmailAndPassword() method (as answered in this question). 4. log('user ' + user. The problem is that when I log in using email, then the app creates some data on Realtime Database under key as per UID (Unique User ID - Acquired By Firebase Auth) of the user. Then do not allow authentication and console. May 18, 2025 · When a user or device successfully signs in, Firebase creates a corresponding ID token that uniquely identifies them and grants them access to several resources, such as Firebase Realtime Database and Cloud Storage. uid exists in firebase auth. addStateDidChangeListener { auth, user in if user != nil { let ref = self. However, how should I go about checking if the current user is logged in throughout the screens of the app? For example, if I want certain screens to only be available to signed in users. 23. Also don't try to get all of then to check if a single one exists. Firebase: How to check if user May 15, 2020 · The user is not created in firebase database then it should prompt the user that such user does not exist in firebase. It's very similar to Firebase's ValueEventListener, but this interface is just for your own use. May 18, 2025 · Authenticated private: check that request. May 18, 2025 · Important: To delete a user, the user must have signed in recently. Log ("Setting up Firebase Auth"); auth = Firebase. I found out I can use the FirebaseUser. Reading all of them would blow up your Firebase bill. Nov 1, 2020 · Hi all, this is an issue in the Auth Emulator and we're drafting a fix to be released in the CLI. signIn(); GoogleSignInAuthentication authentication = await account. – May 26, 2019 · The best you can do is send a verification email to your user, which is supported by Firebase. Unique username in Firebase with Flutter. Check here how to send the user the verification email and here how to see if the email has been verified. Firebase documentation just provides a function to login to facebook but doesn't mention if the user is new or not. Mar 15, 2021 · I have setup authentication with microsoft login using firebase, this is the code inside my signIn function: User user = await FirebaseAuthOAuth(). public interface UserExistsCallback { void onCallback(boolean value); } This interface can be as specific or generic as you want. A user has to provide the following details to register: Full Name; Email ; Username; Password; Database Structure. if the user phone number doesn't already exist he's redirected to a page with username and pa Dec 24, 2019 · Firebase Check if user already exists. Auth. May 19, 2020 · So i am making a simple sign up and login screens in flutter application that uses phone authentication of firebase. User authentication is a pivotal part of any modern mobile application. @JenPerson – Aug 10, 2022 · On button press (OnSignIn) the user gets a GoogleSignIn popup, on completion im signing the user with those credentials into firebase with SignInWithCredentialAsync. The question mark in currentUser?. Currently, when resetting the password a toast notification alerts the user that a password reset requested. When the user arrives at the homepage, we check if this newly created user. You can also delete users from the Authentication section of the Firebase console, on the Users page. metadata. users table but it seems like i have to create a separate public table and duplicate all the data i want to expose from auth. From the docs: FirebaseAuthUserCollisionException Jul 4, 2021 · im very new to dart/firebase and im currently experimenting with it. Each time I start the app, I would like to verify if the user still exists. – May 16, 2017 · The problem I am facing is that I get email and password from user and then create that user into firebase. Jan 23, 2022 · You'll need to know at least part of the user's credentials to check if they already exist in Firebase Authentication. When a user signs in, you check if a user with the specified uid exists in the database or not. it keep saying not found. Firebase check auth status of user/ if user After a user sign in successfully, I want to use the User UID to verify the user has selected the right school, I have been able to achieve this task, but the problem is, I have to click the login Sep 4, 2022 · I think what are you looking for is the firebase-admin SDK and the cloud functions. You can re-use that ID token to identify the user or device on your custom backend server. May 28, 2019 · i need to check if username already exists in real time database then prompt user to select another username. 0")) // Add the dependency for the Firebase Authentication library // When using the BoM, you don't specify versions in Firebase library dependencies implementation ("com. What I want to achieve is by running the user input and check within the authentication identifier email addressed whether the email already exist. A new user gets a new firebase user id, while an existing user just logs in. Now when you sign up, the function would copy your user details from auth. isNewUser if the user is not already registered before. Now I want to implement reset password feature. Firebase would only check if the password matched the one in the database IF the email exist. Apr 27, 2021 · I need a littel help with Firestore. It is not an app so I am interacting with the database and the auth system through their REST API. Normally, when user visits the website I'm fetching all users data from firebase and assigning it to users state and then if user click Play button I'm checking if username exist. I use Firebase Authentication and would like to check whether an email is already registered in the app. For the user's ease, I have now added Google Sign-In in the project as well. function userFirstTimeCallback(userId, exists) {if (exists) {alert('user ' + userId + ' exists!'); // Do something here you want to do for non-firstime users} else There’s an option within firebase auth which determines what should happen in this case. Aug 24, 2021 · When registering a new user you can check there is a username already exists. For that Firebase provides resetPassword method and send reset password email to that particular user. Dec 15, 2016 · When an user signs up on my site, I call firebase. com // Call your function to check if they are a first time user (aka exists). Otherwise they would go to a questions page which they would finish first before registering the user onto the database. trim(),password: password); Jun 19, 2019 · allow read, update, delete: if request. Introduction to User Authentication with Firebase Auth. Hey, I want to check if a user exists with an email and so i want to get user data by email from the auth. The method you're looking for is called fetchSignInMethodsForEmail . I plan to send a user. You can also check the console tab to see if you're getting any logs at all. For sign up im able to register new user, as the user provides his phone number and gets OTP. What is the best way to check if the user is new in firebase auth with flutter. I need to check the RTDB because the users document is stored there, but a good choice also is to check into the list of users into the authentication service – Sep 18, 2016 · According to the new version of Firebase auth (16. Edit: How can check if user exist in Login method in firebase. The flow for this is typically that: You ask/determine the email address of the user. users table to my public. I am so thankful to hear your answers. Feb 28, 2022 · To check whether a given email address is already registered in Firebase, you can call the fetchSignInMethodsForEmail methods. May 18, 2025 · The Firebase Admin SDK provides an API for managing your Firebase Authentication users with elevated privileges. reload() function. The signup page, login page and reset password via sending an email are all fully functional. Can you make sure that email in the request is not used by any users as Identifier in the Firebase Authentication. May 18, 2025 · By combining these two concepts, you can control access to data based on user identity. Oct 1, 2020 · I am using Firebase authentication in my React Native application development. com" Aug 26, 2019 · To determine if the user is signed in with Google, you can check if the list of providers provided by the Firebase Authentication library includes the Google Auth Provider ID as the following: May 18, 2025 · firebase. i used this Firebase ref= new Firebase(USERS_LOCATION); ref. Update. users table. If it returns an empty array, the email address is not used by any account. authentication; OAuthCredential credential = GoogleAuthProvider. BUT when I removed the app and install it again, then I press again the same phone number and I get again a SMS although this user already exists in the Jul 28, 2022 · I'm creating a game that user can login with just a username as a guest and play. May 18, 2025 · Completing sign-in in a mobile app. First store the Firebase Phone Auth in FirebaseDatabase after every successful registration, then add a check when user try and enter the phone number if it already exist in database, If present then you got your answer otherwise register the user. code: null != mAuth. Assuming "credential" is defined in the scope(it is the google credential ). I'm storing the displayName in users: root / users / document *(uid as id)* / fields Jun 19, 2018 · I do save information of the user in the database node, and I could query that, however, with over 75k users that call is costly and takes a while to return, and it wouldn't help in cases where the Authentication call to register the user is successful but storing their details to the Database node is unsuccessful. createUserWithEmailAndPassword(email, password) and their user has successfully been created. Once a user signs in, you can check their email verification status using the emailVerified property. The admin user management API gives you the ability to programmatically complete the following tasks from a secure server environment: Dec 19, 2017 · In this video, i have shown how to detect if the user is already registered in Firebase Database using Android Studio. Aug 6, 2017 · Check firebase. I want to check if username already exists; // "That username already exists". Jul 5, 2019 · import { fetchSignInMethodsForEmail } from 'firebase/auth'; fetchSignInMethodsForEmail(auth, email). I want to check if the email already exists in my database. However, if the user does not exist. Also see: Check if given email exists; Check if an email already exists in Firebase Auth in Flutter App Jul 21, 2024 · I'd like to check if an entered email address already exists in my backend before creating a new user. How can I authenticate my Firebase account on Android? Jul 26, 2019 · I'm currently building a game with unity and Firebase, but instead of using Firebase authentication for Facebook, I did it on my own. Auth. Mar 15, 2021 · I have a two-step Login form where the user enters their email first, then is taken to the next page where they enter their password. But if you are trying to wait until the user signs in to do something, you should Oct 28, 2018 · I want to check whether the user already exists in Firebase when they log in with Facebook or whether it's their first time. May 18, 2025 · Authentication. Aug 17, 2016 · The code below works great on android to confirm if the Firebase Auth user still exists (has not been deleted or disabled) and has valid credentials. firebase check if account connected with facebook. an email misspelled like [email protected] will pass the validation. Deleting the Auth user from the firebase console does not revoke auth tokens on devices the user is currently logged in as the token is cached locally. Persistence. emailVerified //returns boolean Nov 30, 2020 · I am using the below code for google sign in flutter app with firebase, which is working successfully. auth is not null; User private: check that request. So on first page i want to check that email is registered or not. Penting: Untuk menghapus pengguna, pengguna tersebut harus sudah pernah login baru-baru ini. Any rule that doesn't consider the request. When you want to create a user in firebase, you do auth Apr 11, 2018 · In order to detect whether that phone number has already been used for account registration, you can't only rely on the default authentication table. LOCAL 'local' Indicates that the state will be persisted even when the browser window is closed or the activity is destroyed in React Native. signInWithEmailAndPassword(email, password). firebase:firebase-auth")} Authentication state# Firebase Auth provides many methods and utilities for enabling you to integrate secure authentication into your new or existing Flutter application. auth context can be considered a public Jul 27, 2020 · Just before adding a new user to firebase, I want to check if the displayName already exists for an other user. The predefined auth variable in the rules is null before authentication takes place. com/docs/auth/admin/manage-users#retrieve_user_data. This shows the users/emails that are associated with accounts that have admin access to the firebase project and console. To detect whether a user with that email address already exists, you can detect when the call to createUserWithEmailAndPassword fails with auth/email-already-in-use. One of the most common security rule patterns is controlling access based on the user's authentication state. Nov 14, 2021 · Firebase: How to check if user already exists. then((result) => { console. uid equals a path uid; Group private: check the custom token's claims to match a chosen claim, or read the file metadata to see if a metadata field exists; Public. However, the user experience is going to be blocked until the user verifies the email. Please be aware that this type of function can be misused to validate of an email is valid and used already, opening up for exploit. The problem Oct 18, 2016 · EDIT: To check if user is 'made-up' or 'real', just send an email verification by calling FirebaseAuth. 0 will NOT fix the issue -- 9. email + ' does exist!');. getCurrentUser(). Jul 18, 2022 · I usually keep a users' list in a Firebase database and manage users there. At very minimum you can utilize conditional statements such as if / else or switch to check for that code and display/log/dispatch/etc a message or code to the user: . creationTime === firebase. auth(). sendEmailVerification() and ask user to click the link sent in their email, if user is able to perform this action then email exists otherwise it's 'made-up'. Aug 5, 2018 · How to check if a user already exists in firebase during phone auth. Aug 20, 2017 · I’m working on an forum app that uses Firebase and sqlite. Sep 24, 2021 · I built a login/register system, and I want that when you create a username it checks if email exists, it works fine and it shows the message box "Email exists", but when it is a new user and there is no email that exists, it crashes. In many cases, you will need to know about the authentication state of your user, such as whether they're logged in or logged out. Jul 27, 2018 · Per the documentation the error code auth/email-already-in-use: Thrown if there already exists an account with the given email address. onAuthStateChanged() register an observer - it gets triggered over tie when the user's auth state changes. It's not good for getting one-time readings that must be returned immediately. Mar 4, 2024 · We'll cover everything from setting up Firebase Auth in your Flutter project to implementing checks for the user's login status, ensuring your app's authentication flow is smooth and secure. Aug 20, 2017 · Currently, when resetting the password a toast notification alerts the user that a password reset requested. log you cannot access that key. I see that @Srinivasan just posted an answer for this. Given the loose definition of the meaning of the display name, it would be of limited use. If you like the video please like, sha Dec 9, 2016 · I was going to check the email against this list and if it didn't exist then I would allow the user to proceed with the registration process. isNewUser property from the result received from signInWithPopUp method to check if the user is new. delete(), otherwise it's not a new user and you can handle it accordingly. Sep 17, 2023 · How to create a "check if username exists" feature on Flutterflow with Supabase? As the title suggest, I'm creating a tool that allows users to create usernames. Here is the exception message: Aug 2, 2022 · im trying to check if the user already exists in the collection and at this point i don't even know what to do. If the user had already created an account and clicks on a magic link, the user is logged in as if they signed in using magic link, so no need to worry about anything further. Also, friendly reminder that downgrading firebase-admin to 9. FirebaseAuth auth; Firebase. Firebase Auth and Swift: Check if email already in Jun 21, 2022 · I am writing a Java program and using a firebase Realtime Database as my database and Firebase Auth as my Auth system. If it's a new user you can delete the user via firebase. For example, if the user signed in with a provider that requires their email before, you'll should ask them for their email address next time and then call fetchSignInMethodsForEmail to determine if Firebase already has a user To check if a user's email already exists in Firebase Authentication using Android Studio, you can utilize the `fetchSignInMethodsForEmail` method provided by the Firebase Authentication SDK. 1. My issue is that I can't find a way to check if a user already exists with a given email. ref. if there is a method to check only the mail. An explicit sign out is needed to clear that state. log(result); }); It returns length of 0 if email doesn't exist, if the email does exist and is registered with email and password it will return length of 1 with value of 'password'. is there a simple way to just get user by email in my server action? Aug 23, 2021 · If a user with that credential exists then user will be logged in else a new user account will be created. You can then use additionalUserInfo. If the email does exist then it would show a different form to tell the user to login. firebase. Sep 22, 2023 · Before you can check email verification status, ensure you've initialized Firebase Authentication in your project. But the question is that if email is Aug 3, 2017 · I am using Firebase Anonymous Authentication. If the email Doesn't. I’ve successfully created a Sign Up where I can see that new users are being added to the Firebase Authentication. (email is existing on the Firebase project). But for login i wanna check if the entered number is already registered. Anda juga bisa menghapus pengguna dari bagian Authentication pada Firebase console, di halaman Pengguna. Initially the user is anonymous, and they try to login with Facebook. Once a user is authenticated with Firebase Authentication it will contain the following attributes: Nov 16, 2022 · I have this function to create authentication in my firebase but the problem is when the user enters an email that already exists my app will stop com. 0 does not support Auth Emulator at all, and your requests WILL AFFECT PRODUCTION. child(user. exists() { // TODO: a user is signed in and registered, navigate to Sep 11, 2018 · I need to check if the user is signing in for the first time, and initialize their account with extra properties (points, membership, etc) if true. – Saranya Commented May 13, 2020 at 15:34 In flutter i want to check if the user's email exists in the firebase auth without registering the user. Here is what I have so fare. const Form = () => { const [email, setEm Oct 22, 2019 · I have firebase auth where there is an allowance for anonymous logins. auth. //Implement AuthBase in class Auth class Auth implements AuthBase As you might have guessed this property returns whether the currently signed-in user is a new user or not. then() I would like to know if there is not another method to directly verify if the user does not exist. See Re-authenticate a user. This means after you login even if you restart the app completely when you open the app again you are still logged in, and do not need to verify the number again unless you call Auth. You can then get the user's basic profile information from the User object. I know I can add UIDs manually in Firebase and check against this data, but is it possible to see what UIDs Firebase authentication is tracking? Jun 6, 2018 · It gets the User ID (if exists) which is recorded on Firebase Authentication UID field for each user have been authenticated on the app before, otherwise it returns null. additionalUserInfo. Previously you had to do that on your own and keep track of the user using Firebase Realtime Database. Dec 3, 2018 · The code below works great on android to confirm if the Firebase Auth user still exists (has not been deleted or disabled) and has valid credentials. catch(error => { See full list on firebase. I tried to write one with the login firebase method but it doesn't work correctly because I need the password to check. I’ve been trying to add a function that checks if the email exist and alerts the user if the email does not exist. I see from the answer here: Proper way to store values array-like in Firebase that Firebase creates keys inside the array. seems like to much of a hassle. checkForFirstTime(userid); // Setup what to do with the user information. Now this database can be used to check existing users. log the object exists with the current user key, and on the second console. If yes, I notify user about the account already exists with this email. value, with: { snapshot in if snapshot. This method returns the sign-in methods that correspond to the email provided, indicating whether the email is linked to an existing account. addValueEventListener(new ValueEventListener() {public void onDataChange(DataSnapshot snapshot May 8, 2025 · The method createUserWithEmailAndPassword will check if an email already exists inside firebase authentication. I have a users data collection, user id-documents with each user information. 2. createUserWithEmailAndPassword(user Aug 6, 2019 · The issue Executing firebaseInstance. Sep 18, 2020 · When your application starts-up you can query the current Firebase User from Firebase Auth and if the user from the previous session should be returned to you and it can be reused. signOut() somewhere. This is how I am inserting users in my firebase-database and I want to check if a username is { // User Exists // Do your stuff here if user already exits Aug 17, 2017 · I have an Android app that already has Email and Password authentication using Firebase. Also, how do I retrieve user information such as ID May 21, 2021 · this is part of my code i want to check if a username already exists on the database in firebase try { await firebase. Apr 2, 2017 · If the user is already signed In and you want to check if the email is verified you have to reload the current users data since its cached. Im trying to figure out if theres a way to find out if a collection exists or not. Sep 26, 2018 · But I don't want a new user to sign in if they are not already an authenticated user. If not it then creates a new user with that uid. currentUser(). 0. If that email is already registered then user navigate to next page that is password page where user will enter password and sing in into the app. credential( accessToken: authentication. Nov 18, 2018 · This is my first time using Thunkable. Mar 2, 2021 · This code should check if a user exists in firebase, run <Text> You are signed in <Text/> if there is a current user, and run the sign-in code otherwise. You can query the providers associated with that FirebaseUser via the ProviderData property. idToken, ); UserCredential userCredential If you disable or delete a user account does not mean that it also fires an auth state change. createUserWithEmailAndPassword(email: email. onStart(); // Check if user is signed in (non-null) and update UI accordingly. Jun 16, 2017 · A new bee to Firebase, I am trying out the Firebase Authentication and trying to check if user is logged-in. Just call the path usernames/{username} and if that is null there username doens't exist. Sep 27, 2023 · The response you are getting is for the successful one. currentUser; Oct 31, 2020 · You can check the user whether he is a new or previously registered user via User Credential and through you can retrieve the authResult. Thanks man. I think it because of how my data is nested. ts May 31, 2018 · You can check whether user already exist in Firebase by compare it metadata. uid with a POST to this route, and I want to validate the UID is one that exists in Firebase. For that, you're supposed to use firebase. When a new user registers on my app, that user's data is saved in the Firebase database. Jan 11, 2022 · The firebase SDK persists the logged in user to disk. Jun 17, 2016 · I still find it strange how on the first console. Aug 9, 2018 · I get the Alex Mamo's Solution in order to check whether a unique value exists in my database but the snapshot gets always null. child("users"). delete (); Important: To set a user's email address, the user must have signed in recently. currentUser. instance. thank. Oct 27, 2018 · CONTEXT: In firebase settings, there's a permissions tab. Oct 16, 2019 · I've looked across for many solution but most of it is related to either checking if the auth user is logged in or not, or by using the document reference to read through and check for user email. signup. How should I check that whether the email id used is already existing in the firebase authenti May 18, 2025 · dependencies {// Import the BoM for the Firebase platform implementation (platform ("com. Feb 19, 2017 · I am building a server route that I wish to restrict for use only by authenticated users. I am not verifying email which user has entered. Oct 25, 2018 · First we'll create a custom interface that you can implement anywhere where you need to check if a user already exists. see code example: Firebase check auth status of user/ if user exists. One option: if a user has an email and signs in with Google account, it will automatically change the auth type. I want this to fail if the Facebook account is Sep 10, 2020 · Find whether email and username already exist in Firebase Auth in Flutter App. Where I create function to fetch users using firebase May 18, 2025 · Firebase. google. auth(); Step 2: Check Verification Status. I have implemented the email auth and want to check if the user already registered or not? I have used: final newUser = await _auth. isAnonymous() I am getting false. uid is a Null safety to avoid null exception (returns null if null). Nor should it, because the user is still authenticated in the application. accessToken, idToken: authentication. Users enter their email and password during signup. Jun 12, 2020 · I can say that's easy to check if it's a valid email pattern, there are some fancy regex like here: regex to validate email. Sep 29, 2017 · I started with firebase (web) I would like to know how to programmatically verify that a user already exists in the firebase user table without using the. firebase phone authentication works like that only each time you need to send otp sent by firebase to verify user, you can write extra code to check the specific phone number os already logged in or not by storing the a boolean in internal storage after the successful authentication by firebase and can check if user comes on that activity if that boolean is true send him to next activity Jul 19, 2022 · On the backend, an email will be sent to the user, which will contain a confirmation link if the user did not exist prior, or a magic link if the user already did exist. 1) The AuthResult class has a member function which results true or false (is the user is new). In my route handler for /api/auth/signup, I check whether the same email already exists in users table. So just put it in a try-catch loop and use it to check if the user exists or not. You can easily detect if the user is logged or not by executing: var user = firebase. Hot Network Questions How can I get the return object (-1 if the user does not exist), check it, and either close the modal or turn it red with react strap if the user does not exist? Snippet of my firebase function followed by my React modal below. Please help me, here is my code so far. reload() Once that is done you can easily check if the email is verified. Jul 28, 2017 · Actually my design is like there is first page where user will enter the email address. Feb 7, 2020 · Check current auth state When initializing your Activity, check to see if the user is currently signed in. reset-password. Prior to taking the user to the password page, I want to check if the email entered by the user is valid and whether it exists in firebase. Dec 12, 2017 · There is no built-in support in Firebase Authentication to look up users by their display name. Is there a built in way to check if the an email is already in use in Authentication? You can use getUserByEmail () https://firebase. How can I send reset password emails only for Firebase registered users? Aug 13, 2018 · Future<void> signInWithGoogle() async { GoogleSignInAccount account = await googleSignIn. firebase. In your Firebase Realtime Database and Cloud Storage Security Rules, you can get the signed-in user's unique user ID from the auth variable May 3, 2018 · To avoid further implementation in the catch block you can wrap this Firebase function into this code: async function checkUserInFirebase(email) { return new Promise Aug 26, 2022 · await user?. As Result i recieve the FirebaseUser, but for my api on a backend server i need to know if the user got just created or was already existent on firebase. // Initialize Firebase Authentication const auth = firebase. Mar 20, 2022 · If you want to check if a user already exists in Firebase Authentication for a specific email address, you can call the fetchSignInMethodsForEmail method. observeSingleEvent(of: . I basically want a "Do I have an account" on my Jan 5, 2017 · So i'm working with Firebase web email authentication and I came across this issue. When the user enters their email you could perform an api call to your backend and test if the email are registered already. email + ' does not exist!') If you have questions for use in a company or government at scale (>1000 users), do yourself a favor and contact Nextcloud itself - this community is mostly home-user focused! Members Online 403 Forbidden when trying to make a folder in the nextcloud page Apr 15, 2022 · I have a situation when a user enters a phone number, then I user verify phone number then sent code and add this user to Authentication users in Firebase console and he has unique UID. Mar 1, 2021 · On my signup page i want to check if a certain user with the an email that i specify exists or not. May 10, 2018 · I build react native app with firebase with this react-native-firebase and I implement firebase auth phone authentication. For example, your app may want to allow only signed-in users to write data: Apr 12, 2022 · I'm building an app where i prompt the user to authenticate with their phone number in the first place. 2. FirebaseUser user; // Handle initialization of the necessary firebase modules: void InitializeFirebase {Debug. If the user exists then sign them in and console. then(u => {}) . Whenever a new user tries to register, I have to make sure that each user's username is unique so I check the database if the username May 18, 2022 · I want to do a check on the user email. Check if an email already exists in Firebase Auth in Flutter App. May user change his device and wants login again Feb 21, 2019 · I am developing a Flutter App and want to use Firebase Auth for user login. Baca bagian Mengautentikasi ulang pengguna. 0. However Aug 2, 2018 · I'm currently developing a flutter app that requires users to register before using it. uid == user; allow create: if request. This way I check if user document exists in my Firestore Database and if not it creates it. Whenever a user authentication success, I input the same username into one of the databases (either Firestore or the Realtime Database) in firebase. 17. getCurrentUser(); And this returns true though I am not logged in but I have enabled annonymous login and I thought that could be the issue but when I check mAuth. I have read a few posts about using fetchSignInMethodsForEmail. Warning: The following three Firebase Authentication features are impacted by the shutdown of Firebase Dynamic Links on August 25, 2025: email link authentication for mobile apps, OAuth flows for Android apps using older versions of the Authentication SDK, and Cordova OAuth support for web apps. Ive created a method where everytime a user But what if I just want to verify that the user exists or not, because if it doesn't exists, i might not want to create a new auth entry, but merge with an existing auth (if I find this new logged in user already have an account with the same email, i will merge with that instead of creating another account). lastSignInTime. currentUser before the firebase finishes completing it's internal logic returns null, this makes me wonder if it's possible to listen for event when firebase auth completes it's internal tasks --> check for the current user, and if even after that there is still no user --> signIn with a new anonymus one. If that user doesn't exist, it will throw an error. Jun 17, 2016 · There's no need to use onAuthStateChanged() function in this scenario. I want the user to create a username that doesn't already exist in the Supabase database. If it exists, I want to navigate them to a different page informing them about the duplicate email. In the cloud functions, you have access to the auth API and you can check if a certain email exists in the firebase auth and which provider. uid != null; Which basically means, that you allow the read, update and delete operations only if the id of the user is the same with the one from Firebase authentication and you allow the creating of a new user only if the uid of the user is null. In case a user has been deleted from the Firebase console, the client still believes the user exists, as it still holds the token. . Here is what I Sep 15, 2021 · Users created by calling createUserWithEmailAndPassword exist in Firebase Authentication, not in Firestore or Realtime Database (unless you stored them there). nevertheless, they check if it's a valid pattern, not a valid provider. The auth Variable. 6 days ago · In your apps, the recommended way to know the auth status of your user is to set an observer on the Auth object. auth. mqbnkmjinkivlklinnqpuaolhlptkzwroxjyojxsged