firebase change authentication required code example

Example 1: how to change user password firebase

var user = firebase.auth().currentUser;
var newPassword = getASecureRandomPassword();

user.updatePassword(newPassword).then(function() {
  // Update successful.
}).catch(function(error) {
  // An error happened.
});

Example 2: firebase auth get current user

var user = firebase.auth().currentUser;var name, email, photoUrl, uid, emailVerified;if (user != null) {  name = user.displayName;  email = user.email;  photoUrl = user.photoURL;  emailVerified = user.emailVerified;  uid = user.uid;  // 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.getToken() instead.}