Managing users programmatically

This document shows you how to use the Identity Platform Admin SDK to manage your users programmatically. The Admin SDK allows you to perform a wide range of common administrative tasks, such as creating, looking up, and modifying users.

Before you begin

Install the Admin SDK.

Getting a user

Getting a user by ID

The primary way to identify a user is by their uid:

Node.js

admin.auth().getUser(uid)
  .then(function(userRecord) {
    // See the UserRecord reference doc for the contents of userRecord.
    console.log('Successfully fetched user data:', userRecord.toJSON());
  })
  .catch(function(error) {
    console.log('Error fetching user data:', error);
  });

Java

UserRecord userRecord = FirebaseAuth.getInstance().getUser(uid);
// See the UserRecord reference doc for the contents of userRecord.
System.out.println("Successfully fetched user data: " + userRecord.getUid());

Python

from firebase_admin import auth

user = auth.get_user(uid)
print('Successfully fetched user data: {0}'.format(user.uid))

Go

// Get an auth client from the firebase.App
client, err := app.Auth(ctx)
if err != nil {
	log.Fatalf("error getting Auth client: %v\n", err)
}

u, err := client.GetUser(ctx, uid)
if err != nil {
	log.Fatalf("error getting user %s: %v\n", uid, err)
}
log.Printf("Successfully fetched user data: %v\n", u)

C#

UserRecord userRecord = await FirebaseAuth.DefaultInstance.GetUserAsync(uid);
// See the UserRecord reference doc for the contents of userRecord.
Console.WriteLine($"Successfully fetched user data: {userRecord.Uid}");

Getting a user by email

You can also get a user using their email:

Node.js

admin.auth().getUserByEmail(email)
  .then(function(userRecord) {
    // See the UserRecord reference doc for the contents of userRecord.
    console.log('Successfully fetched user data:', userRecord.toJSON());
  })
  .catch(function(error) {
   console.log('Error fetching user data:', error);
  });

Java

UserRecord userRecord = FirebaseAuth.getInstance().getUserByEmail(email);
// See the UserRecord reference doc for the contents of userRecord.
System.out.println("Successfully fetched user data: " + userRecord.getEmail());

Python

from firebase_admin import auth

user = auth.get_user_by_email(email)
print('Successfully fetched user data: {0}'.format(user.uid))

Go

u, err := client.GetUserByEmail(ctx, email)
if err != nil {
	log.Fatalf("error getting user by email %s: %v\n", email, err)
}
log.Printf("Successfully fetched user data: %v\n", u)

C#

UserRecord userRecord = await FirebaseAuth.DefaultInstance.GetUserByEmailAsync(email);
// See the UserRecord reference doc for the contents of userRecord.
Console.WriteLine($"Successfully fetched user data: {userRecord.Uid}");

Note that you can only search using primary emails, not provider-specific emails. For example, if a Facebook account with the email facebookUser@example.com is linked to an existing user with the email user@example.com, calling getUserByEmail("facebookUser@example.com") will yield no results. Calling getUserByEmail("user@example.com") will return the expected user.

The primary email depends on your account linking settings:

  • Link accounts that use the same email: The primary email is the first email used to sign in, unless manually updated.
  • Create multiple accounts for each identity provider: The primary email is only set when a password user is created, unless manually updated.

Getting a user by phone number

If a user has a phone number, you can look them up using it:

Node.js

admin.auth().getUserByPhoneNumber(phoneNumber)
  .then(function(userRecord) {
    // See the UserRecord reference doc for the contents of userRecord.
    console.log('Successfully fetched user data:', userRecord.toJSON());
  })
  .catch(function(error) {
    console.log('Error fetching user data:', error);
  });

Java

UserRecord userRecord = FirebaseAuth.getInstance().getUserByPhoneNumber(phoneNumber);
// See the UserRecord reference doc for the contents of userRecord.
System.out.println("Successfully fetched user data: " + userRecord.getPhoneNumber());

Python

from firebase_admin import auth

user = auth.get_user_by_phone_number(phone)
print('Successfully fetched user data: {0}'.format(user.uid))

Go

u, err := client.GetUserByPhoneNumber(ctx, phone)
if err != nil {
	log.Fatalf("error getting user by phone %s: %v\n", phone, err)
}
log.Printf("Successfully fetched user data: %v\n", u)

C#

UserRecord userRecord = await FirebaseAuth.DefaultInstance.GetUserByPhoneNumberAsync(phoneNumber);
// See the UserRecord reference doc for the contents of userRecord.
Console.WriteLine($"Successfully fetched user data: {userRecord.Uid}");

Bulk retrieve user data

You can also retrieve a list of users based on identifiers that you provide. You may identify users by their uid, email, or phone number. A maximum of 100 identifiers may be supplied in a single call. Identifiers can contain a mix of types:

Node.js

admin.auth().getUsers([
    { uid: 'uid1' },
    { email: 'user2@example.com' },
    { phoneNumber: '+15555550003' },
    { providerId: 'google.com', providerUid: 'google_uid4' },
  ])
  .then(function(getUsersResult) {
    console.log('Successfully fetched user data:');
    getUsersResult.users.forEach((userRecord) => {
      console.log(userRecord);
    });

    console.log('Unable to find users corresponding to these identifiers:');
    getUsersResult.notFound.forEach((userIdentifier) => {
      console.log(userIdentifier);
    });
  })
  .catch(function(error) {
    console.log('Error fetching user data:', error);
  });

Java

GetUsersResult result = FirebaseAuth.getInstance().getUsersAsync(Arrays.asList(
    new UidIdentifier("uid1"),
    new EmailIdentifier("user2@example.com"),
    new PhoneIdentifier("+15555550003"),
    new ProviderIdentifier("google.com", "google_uid4"))).get();

System.out.println("Successfully fetched user data:");
for (UserRecord user : result.getUsers()) {
  System.out.println(user.getUid());
}

System.out.println("Unable to find users corresponding to these identifiers:");
for (UserIdentifier uid : result.getNotFound()) {
  System.out.println(uid);
}

Python

from firebase_admin import auth

result = auth.get_users([
    auth.UidIdentifier('uid1'),
    auth.EmailIdentifier('user2@example.com'),
    auth.PhoneIdentifier(+15555550003),
    auth.ProviderIdentifier('google.com', 'google_uid4')
])

print('Successfully fetched user data:')
for user in result.users:
    print(user.uid)

print('Unable to find users corresponding to these identifiers:')
for uid in result.not_found:
    print(uid)

Go

getUsersResult, err := client.GetUsers(ctx, []auth.UserIdentifier{
	auth.UIDIdentifier{UID: "uid1"},
	auth.EmailIdentifier{Email: "user@example.com"},
	auth.PhoneIdentifier{PhoneNumber: "+15555551234"},
	auth.ProviderIdentifier{ProviderID: "google.com", ProviderUID: "google_uid1"},
})
if err != nil {
	log.Fatalf("error retriving multiple users: %v\n", err)
}

log.Printf("Successfully fetched user data:")
for _, u := range getUsersResult.Users {
	log.Printf("%v", u)
}

log.Printf("Unable to find users corresponding to these identifiers:")
for _, id := range getUsersResult.NotFound {
	log.Printf("%v", id)
}

C#

GetUsersResult result = await FirebaseAuth.DefaultInstance.GetUsersAsync(
    new List<UserIdentifier>
    {
        new UidIdentifier("uid1"),
        new EmailIdentifier("user2@example.com"),
        new PhoneIdentifier("+15555550003"),
        new ProviderIdentifier("google.com", "google_uid4"),
    });

Console.WriteLine("Successfully fetched user data:");
foreach (UserRecord user in result.Users)
{
    Console.WriteLine($"User: {user.Uid}");
}

Console.WriteLine("Unable to find users corresponding to these identifiers:");
foreach (UserIdentifier uid in result.NotFound)
{
    Console.WriteLine($"{uid}");
}

This method returns a list the same size as the input list, with each entry containing either the corresponding UserRecord or an error, indicating why that identifier was not able to be looked up.

Listing users

The code below shows how to list all users:

Node.js

function listAllUsers(nextPageToken) {
  // List batch of users, 1000 at a time.
  admin.auth().listUsers(1000, nextPageToken)
    .then(function(listUsersResult) {
      listUsersResult.users.forEach(function(userRecord) {
        console.log('user', userRecord.toJSON());
      });
      if (listUsersResult.pageToken) {
        // List next batch of users.
        listAllUsers(listUsersResult.pageToken);
      }
    })
    .catch(function(error) {
      console.log('Error listing users:', error);
    });
}
// Start listing users from the beginning, 1000 at a time.
listAllUsers();

Java

// Start listing users from the beginning, 1000 at a time.
ListUsersPage page = FirebaseAuth.getInstance().listUsers(null);
while (page != null) {
  for (ExportedUserRecord user : page.getValues()) {
    System.out.println("User: " + user.getUid());
  }
  page = page.getNextPage();
}

// Iterate through all users. This will still retrieve users in batches,
// buffering no more than 1000 users in memory at a time.
page = FirebaseAuth.getInstance().listUsers(null);
for (ExportedUserRecord user : page.iterateAll()) {
  System.out.println("User: " + user.getUid());
}

Python

# Start listing users from the beginning, 1000 at a time.
page = auth.list_users()
while page:
    for user in page.users:
        print('User: ' + user.uid)
    # Get next batch of users.
    page = page.get_next_page()

# Iterate through all users. This will still retrieve users in batches,
# buffering no more than 1000 users in memory at a time.
for user in auth.list_users().iterate_all():
    print('User: ' + user.uid)

Go

// Note, behind the scenes, the Users() iterator will retrive 1000 Users at a time through the API
iter := client.Users(ctx, "")
for {
	user, err := iter.Next()
	if err == iterator.Done {
		break
	}
	if err != nil {
		log.Fatalf("error listing users: %s\n", err)
	}
	log.Printf("read user user: %v\n", user)
}

// Iterating by pages 100 users at a time.
// Note that using both the Next() function on an iterator and the NextPage()
// on a Pager wrapping that same iterator will result in an error.
pager := iterator.NewPager(client.Users(ctx, ""), 100, "")
for {
	var users []*auth.ExportedUserRecord
	nextPageToken, err := pager.NextPage(&users)
	if err != nil {
		log.Fatalf("paging error %v\n", err)
	}
	for _, u := range users {
		log.Printf("read user user: %v\n", u)
	}
	if nextPageToken == "" {
		break
	}
}

C#

// Start listing users from the beginning, 1000 at a time.
var pagedEnumerable = FirebaseAuth.DefaultInstance.ListUsersAsync(null);
var responses = pagedEnumerable.AsRawResponses().GetEnumerator();
while (await responses.MoveNext())
{
    ExportedUserRecords response = responses.Current;
    foreach (ExportedUserRecord user in response.Users)
    {
        Console.WriteLine($"User: {user.Uid}");
    }
}

// Iterate through all users. This will still retrieve users in batches,
// buffering no more than 1000 users in memory at a time.
var enumerator = FirebaseAuth.DefaultInstance.ListUsersAsync(null).GetEnumerator();
while (await enumerator.MoveNext())
{
    ExportedUserRecord user = enumerator.Current;
    Console.WriteLine($"User: {user.Uid}");
}

Users are returned in batches, ordered by their uid. Each batch of results contains a list of users, and a next page token used to fetch the next batch. When all users have been listed, no pageToken is returned.

The maxResult field specifies the maximum batch size. The default and maximum value is 1000.

Listing user password hashes

Because password hashes are sensitive, the Admin SDK does not return them unless the user has the firebaseauth.configs.getHashConfig permission. This permission isn't granted by any predefined roles. To grant it:

  1. Create a custom role that grants the firebaseauth.configs.getHashConfig permission.

  2. Grant the custom role to the user or service account.

Subsequent calls to listUsers() by users with this custom role will include the passwordHash and passwordSalt fields.

Creating a user

Creating new users programmatically avoids some restrictions placed on end users. You aren't subject to throttling or rate limiting, and can bypass the normal verification process for emails and phone numbers.

To create a new user:

Node.js

admin.auth().createUser({
  email: 'user@example.com',
  emailVerified: false,
  phoneNumber: '+11234567890',
  password: 'secretPassword',
  displayName: 'John Doe',
  photoURL: 'http://www.example.com/12345678/photo.png',
  disabled: false
})
  .then(function(userRecord) {
    // See the UserRecord reference doc for the contents of userRecord.
    console.log('Successfully created new user:', userRecord.uid);
  })
  .catch(function(error) {
    console.log('Error creating new user:', error);
  });

Java

CreateRequest request = new CreateRequest()
    .setEmail("user@example.com")
    .setEmailVerified(false)
    .setPassword("secretPassword")
    .setPhoneNumber("+11234567890")
    .setDisplayName("John Doe")
    .setPhotoUrl("http://www.example.com/12345678/photo.png")
    .setDisabled(false);

UserRecord userRecord = FirebaseAuth.getInstance().createUser(request);
System.out.println("Successfully created new user: " + userRecord.getUid());

Python

user = auth.create_user(
    email='user@example.com',
    email_verified=False,
    phone_number='+15555550100',
    password='secretPassword',
    display_name='John Doe',
    photo_url='http://www.example.com/12345678/photo.png',
    disabled=False)
print('Sucessfully created new user: {0}'.format(user.uid))

Go

params := (&auth.UserToCreate{}).
	Email("user@example.com").
	EmailVerified(false).
	PhoneNumber("+15555550100").
	Password("secretPassword").
	DisplayName("John Doe").
	PhotoURL("http://www.example.com/12345678/photo.png").
	Disabled(false)
u, err := client.CreateUser(ctx, params)
if err != nil {
	log.Fatalf("error creating user: %v\n", err)
}
log.Printf("Successfully created user: %v\n", u)

C#

UserRecordArgs args = new UserRecordArgs()
{
    Email = "user@example.com",
    EmailVerified = false,
    PhoneNumber = "+11234567890",
    Password = "secretPassword",
    DisplayName = "John Doe",
    PhotoUrl = "http://www.example.com/12345678/photo.png",
    Disabled = false,
};
UserRecord userRecord = await FirebaseAuth.DefaultInstance.CreateUserAsync(args);
// See the UserRecord reference doc for the contents of userRecord.
Console.WriteLine($"Successfully created new user: {userRecord.Uid}");

You can set any of the properties below on a new user. All properties are optional.

Property Type Description
uid string The uid to assign to the newly created user. Must be a string between 1 and 128 characters long, inclusive. If not provided, a random uid will be automatically generated.
email string The user's primary email. Must be a valid email address.
emailVerified boolean Whether or not the user's primary email is verified. If not provided, the default is false.
phoneNumber string The user's primary phone number. Must be a valid E.164 spec compliant phone number.
password string The user's raw, unhashed password. Must be at least six characters long.
displayName string The users' display name.
photoURL string The user's photo URL.
disabled boolean Whether or not the user is disabled. true for disabled; false for enabled. If not provided, the default is false.

Updating a user

Node.js

admin.auth().updateUser(uid, {
  email: 'modifiedUser@example.com',
  phoneNumber: '+11234567890',
  emailVerified: true,
  password: 'newPassword',
  displayName: 'Jane Doe',
  photoURL: 'http://www.example.com/12345678/photo.png',
  disabled: true
})
  .then(function(userRecord) {
    // See the UserRecord reference doc for the contents of userRecord.
    console.log('Successfully updated user', userRecord.toJSON());
  })
  .catch(function(error) {
    console.log('Error updating user:', error);
  });

Java

UpdateRequest request = new UpdateRequest(uid)
    .setEmail("user@example.com")
    .setPhoneNumber("+11234567890")
    .setEmailVerified(true)
    .setPassword("newPassword")
    .setDisplayName("Jane Doe")
    .setPhotoUrl("http://www.example.com/12345678/photo.png")
    .setDisabled(true);

UserRecord userRecord = FirebaseAuth.getInstance().updateUser(request);
System.out.println("Successfully updated user: " + userRecord.getUid());

Python

user = auth.update_user(
    uid,
    email='user@example.com',
    phone_number='+15555550100',
    email_verified=True,
    password='newPassword',
    display_name='John Doe',
    photo_url='http://www.example.com/12345678/photo.png',
    disabled=True)
print('Sucessfully updated user: {0}'.format(user.uid))

Go

params := (&auth.UserToUpdate{}).
	Email("user@example.com").
	EmailVerified(true).
	PhoneNumber("+15555550100").
	Password("newPassword").
	DisplayName("John Doe").
	PhotoURL("http://www.example.com/12345678/photo.png").
	Disabled(true)
u, err := client.UpdateUser(ctx, uid, params)
if err != nil {
	log.Fatalf("error updating user: %v\n", err)
}
log.Printf("Successfully updated user: %v\n", u)

C#

UserRecordArgs args = new UserRecordArgs()
{
    Uid = uid,
    Email = "modifiedUser@example.com",
    PhoneNumber = "+11234567890",
    EmailVerified = true,
    Password = "newPassword",
    DisplayName = "Jane Doe",
    PhotoUrl = "http://www.example.com/12345678/photo.png",
    Disabled = true,
};
UserRecord userRecord = await FirebaseAuth.DefaultInstance.UpdateUserAsync(args);
// See the UserRecord reference doc for the contents of userRecord.
Console.WriteLine($"Successfully updated user: {userRecord.Uid}");

You can update any of the user properties below. All properties are optional. If a property is not specified, its value will remain unchanged.

Property Type Description
email string The user's new primary email. Must be a valid email address.
emailVerified boolean Whether or not the user's primary email is verified. If not provided, the default is false.
phoneNumber string The user's new primary phone number. Must be a valid E.164 spec compliant phone number. Set to null to clear the user's existing phone number.
password string The user's new raw, unhashed password. Must be at least six characters long.
displayName string | null The users' new display name. Set to null to clear the user's existing display name.
photoURL string | null The users' new photo URL. Set to null to clear the user's existing photo URL. If non-null, must be a valid URL.
disabled boolean Whether or not the user is disabled. true for disabled; false for enabled.

Deleting a user

You can delete a user with their uid:

Node.js

admin.auth().deleteUser(uid)
  .then(function() {
    console.log('Successfully deleted user');
  })
  .catch(function(error) {
    console.log('Error deleting user:', error);
  });

Java

FirebaseAuth.getInstance().deleteUser(uid);
System.out.println("Successfully deleted user.");

Python

auth.delete_user(uid)
print('Successfully deleted user')

Go

err := client.DeleteUser(ctx, uid)
if err != nil {
	log.Fatalf("error deleting user: %v\n", err)
}
log.Printf("Successfully deleted user: %s\n", uid)

C#

await FirebaseAuth.DefaultInstance.DeleteUserAsync(uid);
Console.WriteLine("Successfully deleted user.");

Delete Multiple Users

You can also delete multiple users at once:

Node.js

admin.auth().deleteUsers([uid1, uid2, uid3])
  .then(function(deleteUsersResult) {
    console.log('Successfully deleted ' + deleteUsersResult.successCount + ' users');
    console.log('Failed to delete ' +  deleteUsersResult.failureCount + ' users');
    deleteUsersResult.errors.forEach(function(err) {
      console.log(err.error.toJSON());
    });
  })
  .catch(function(error) {
    console.log('Error deleting users:', error);
  });

Java

DeleteUsersResult result = FirebaseAuth.getInstance().deleteUsersAsync(
    Arrays.asList("uid1", "uid2", "uid3")).get();

System.out.println("Successfully deleted " + result.getSuccessCount() + " users");
System.out.println("Failed to delete " + result.getFailureCount() + " users");
for (ErrorInfo error : result.getErrors()) {
  System.out.println("error #" + error.getIndex() + ", reason: " + error.getReason());
}

Python

from firebase_admin import auth

result = auth.delete_users(["uid1", "uid2", "uid3"])

print('Successfully deleted {0} users'.format(result.success_count))
print('Failed to delete {0} users'.format(result.failure_count))
for err in result.errors:
    print('error #{0}, reason: {1}'.format(result.index, result.reason))

Go

deleteUsersResult, err := client.DeleteUsers(ctx, []string{"uid1", "uid2", "uid3"})
if err != nil {
	log.Fatalf("error deleting users: %v\n", err)
}

log.Printf("Successfully deleted %d users", deleteUsersResult.SuccessCount)
log.Printf("Failed to delete %d users", deleteUsersResult.FailureCount)
for _, err := range deleteUsersResult.Errors {
	log.Printf("%v", err)
}

C#

DeleteUsersResult result = await FirebaseAuth.DefaultInstance.DeleteUsersAsync(new List<string>
    {
        "uid1",
        "uid2",
        "uid3",
    });

Console.WriteLine($"Successfully deleted {result.SuccessCount} users.");
Console.WriteLine($"Failed to delete {result.FailureCount} users.");

foreach (ErrorInfo err in result.Errors)
{
    Console.WriteLine($"Error #{err.Index}, reason: {err.Reason}");
}

The delete users method returns a list of failures for the users that were unable to be deleted.

What's next