How can I list all users using firebase admin sdk

Question

Is there a way to list all the users using the firebase admin sdk? Documentation only shows getting one user either by uid or email.

Answer 1

The latest firebase-admin sdk (as of now version 5.4.2) has listUsers API that would do that. The example is here.

One thing to add to the example, the nextPageToken has to be omitted or a valid userid. (IMO, it's not obvious in neither the example or the API doc.)

Answer 2

Update As @Webp says in their answer, there is now an API to list all users in the Admin SDK.

Original answer:

There is no public API to retrieve a list of users from the Firebase Admin SDK.

The typical way to deal with this scenario is to keep a list of the pertinent user information in the Firebase Database. See this original question for more: How do I return a list of users if I use the Firebase simple username & password authentication

Answer 3

You can use auth().listUsers() method provided in the admin sdk. Detailed example code can be found here. Firebase Admin SDK Documentation

Answer 4

Its not a good solution, but you can export user data using Firebase CLI and integrate with your application.

auth:export

firebase auth:export account_file --format=file_format

https://firebase.google.com/docs/cli/auth

Answer 5

In March 2020, after a lot of fighting with documentation and various posts, i found the following works:

const admin = require("firebase-admin");
const serviceAccount = require('./serviceAccount.json'); // see notes below about this.

const listAllUsers = () => {

    const app = admin.initializeApp({
        databaseURL: 'https://your-project-name.firebaseio.com',
        credential: admin.credential.cert(serviceAccount) <-- see notes below about this
    });

    app.auth().listUsers(1000) // lists up to 1000 users
        .then((listUsersResult) => {

            let users = JSON.stringify(listUsersResult);

            const date = new Date();
            const day = date.getDate();
            const month = date.getMonth() + 1;

            fs.writeFileSync(__dirname + `/../my-backups/authentication-backup_${day}_${month}_2020.json`, users);
        })
        .catch(function (error) {
            console.log('Oh no! Firebase listUsers Error:', error);
        });
}

re serviceAccount.json

This is NOT the same as the usual Firebase config you pass-in when using things like react-firebase or the npm firebase module on front end.

To gain CRUD rights server-side, you seem to need the following:

{
  "type": "service_account",
  "project_id": "my-project-id",
  "private_key_id": "xxxxxxxxxxxxxxxxxxx",
  "private_key": "-----BEGIN PRIVATE KEY-----\nMxxxxxxxxxxxxxxzuUA=\n-----END PRIVATE KEY-----\n",
  "client_email": "[e-mail]",
  "client_id": "0000000000000000000",
  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
  "token_uri": "https://oauth2.googleapis.com/token",
  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/firebase-adminsdk-em4gz%40my-proj-name.iam.gserviceaccount.com"
}

If you haven't generated one yet, I got mine by going:

Firebase Console => Project Settings => Service Accounts => Generate New Private Key