import{getAuth,onAuthStateChanged}from"firebase/auth";constauth=getAuth();onAuthStateChanged(auth,(user)=>{if(user){// User is signed in, see docs for a list of available properties// https://firebase.google.com/docs/reference/js/auth.userconstuid=user.uid;// ...}else{// User is signed out// ...}});
auth_state_listener.js

firebase.auth().onAuthStateChanged((user)=>{if(user){// User is signed in, see docs for a list of available properties// https://firebase.google.com/docs/reference/js/v8/firebase.Uservaruid=user.uid;// ...}else{// User is signed out// ...}});
index.js

import{getAuth}from"firebase/auth";constauth=getAuth();constuser=auth.currentUser;if(user){// User is signed in, see docs for a list of available properties// https://firebase.google.com/docs/reference/js/auth.user// ...}else{// No user is signed in.}
auth_current_user.js

constuser=firebase.auth().currentUser;if(user){// User is signed in, see docs for a list of available properties// https://firebase.google.com/docs/reference/js/v8/firebase.User// ...}else{// No user is signed in.}
index.js

constuser=firebase.auth().currentUser;if(user!==null){// The user object has basic properties such as display name, email, etc.constdisplayName=user.displayName;constemail=user.email;constphotoURL=user.photoURL;constemailVerified=user.emailVerified;// The user's ID, unique to the Firebase project. Do NOT use// this value to authenticate with your backend server, if// you have one. Use User.getIdToken() instead.constuid=user.uid;}
manage.js

constuser=firebase.auth().currentUser;if(user!==null){user.providerData.forEach((profile)=>{console.log("Sign-in provider: "+profile.providerId);console.log("  Provider-specific UID: "+profile.uid);console.log("  Name: "+profile.displayName);console.log("  Email: "+profile.email);console.log("  Photo URL: "+profile.photoURL);});}
manage.js

import{getAuth,updateProfile}from"firebase/auth";constauth=getAuth();updateProfile(auth.currentUser,{displayName:"Jane Q. User",photoURL:"https://example.com/jane-q-user/profile.jpg"}).then(()=>{// Profile updated!// ...}).catch((error)=>{// An error occurred// ...});
auth_update_user_profile.js

constuser=firebase.auth().currentUser;user.updateProfile({displayName:"Jane Q. User",photoURL:"https://example.com/jane-q-user/profile.jpg"}).then(()=>{// Update successful// ...}).catch((error)=>{// An error occurred// ...});
manage.js

import{getAuth,updateEmail}from"firebase/auth";constauth=getAuth();updateEmail(auth.currentUser,"user@example.com").then(()=>{// Email updated!// ...}).catch((error)=>{// An error occurred// ...});
auth_update_user_email.js

constuser=firebase.auth().currentUser;user.updateEmail("user@example.com").then(()=>{// Update successful// ...}).catch((error)=>{// An error occurred// ...});
manage.js

import{getAuth,sendEmailVerification}from"firebase/auth";constauth=getAuth();sendEmailVerification(auth.currentUser).then(()=>{// Email verification sent!// ...});
auth_send_email_verification.js

firebase.auth().currentUser.sendEmailVerification().then(()=>{// Email verification sent!// ...});
email.js

import{getAuth}from"firebase/auth";constauth=getAuth();auth.languageCode='it';// To apply the default browser preference instead of explicitly setting it.// auth.useDeviceLanguage();
auth_set_language_code.js

firebase.auth().languageCode='it';// To apply the default browser preference instead of explicitly setting it.// firebase.auth().useDeviceLanguage();
index.js

import{getAuth,updatePassword}from"firebase/auth";constauth=getAuth();constuser=auth.currentUser;constnewPassword=getASecureRandomPassword();updatePassword(user,newPassword).then(()=>{// Update successful.}).catch((error)=>{// An error ocurred// ...});
auth_update_password.js

constuser=firebase.auth().currentUser;constnewPassword=getASecureRandomPassword();user.updatePassword(newPassword).then(()=>{// Update successful.}).catch((error)=>{// An error ocurred// ...});
manage.js

import{getAuth,sendPasswordResetEmail}from"firebase/auth";constauth=getAuth();sendPasswordResetEmail(auth,email).then(()=>{// Password reset email sent!// ..}).catch((error)=>{consterrorCode=error.code;consterrorMessage=error.message;// ..});
auth_send_password_reset.js

firebase.auth().sendPasswordResetEmail(email).then(()=>{// Password reset email sent!// ..}).catch((error)=>{varerrorCode=error.code;varerrorMessage=error.message;// ..});
email.js

import{getAuth}from"firebase/auth";constauth=getAuth();auth.languageCode='it';// To apply the default browser preference instead of explicitly setting it.// auth.useDeviceLanguage();
auth_set_language_code.js

firebase.auth().languageCode='it';// To apply the default browser preference instead of explicitly setting it.// firebase.auth().useDeviceLanguage();
index.js

import{getAuth,deleteUser}from"firebase/auth";constauth=getAuth();constuser=auth.currentUser;deleteUser(user).then(()=>{// User deleted.}).catch((error)=>{// An error ocurred// ...});
auth_delete_user.js

constuser=firebase.auth().currentUser;user.delete().then(()=>{// User deleted.}).catch((error)=>{// An error ocurred// ...});
manage.js

import{getAuth,reauthenticateWithCredential}from"firebase/auth";constauth=getAuth();constuser=auth.currentUser;// TODO(you): prompt the user to re-provide their sign-in credentialsconstcredential=promptForCredentials();reauthenticateWithCredential(user,credential).then(()=>{// User re-authenticated.}).catch((error)=>{// An error ocurred// ...});
auth_reauth_with_credential.js

constuser=firebase.auth().currentUser;// TODO(you): prompt the user to re-provide their sign-in credentialsconstcredential=promptForCredentials();user.reauthenticateWithCredential(credential).then(()=>{// User re-authenticated.}).catch((error)=>{// An error occurred// ...});
manage.js