Delete all users from Firebase Auth

Using the Firebase Admin SDK is really easy and the recommended way to perform such tasks on your Firebase data. This solution is unlike the other makeshift solutions using the developer console.

I just put together a Node.js (https://nodejs.org/en/download) script to delete all users in your Firebase authentication. I have already tested it by deleting ~10000 users. I simply ran the following Node.js code.

To setup Firebase Admin SDK

Create a new folder. Run the following in terminal

npm init

npm install firebase-admin --save

Créer un fichier index.js

var admin = require('firebase-admin');

var serviceAccount = require("/path/to/service/accounts/private/key/json/file");

admin.initializeApp({
    credential: admin.credential.cert(serviceAccount),
    databaseURL: "/url/to/your/database"
});

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

function getAllUsers(nextPageToken) {
    admin.auth().listUsers(100, nextPageToken)
        .then(function(listUsersResult) {
            listUsersResult.users.forEach(function(userRecord) {
                uid = userRecord.toJSON().uid;
                deleteUser(uid);
            });
            if (listUsersResult.pageToken) {
                getAllUsers(listUsersResult.pageToken);
            }
        })
        .catch(function(error) {
            console.log('Error listing users:', error);
        });
}

getAllUsers();

Steps to follow:

• Go to your Firebase project -> Project Settings -> Service Accounts.
• Click on Generate new Private Key to download the JSON file. Copy the path to JSON file and replace it in the code below in the path to service accounts private key json file.
• Also, copy the databaseURL from the settings page. Replace it in the code.
• Copy and paste the code in index.js.
• Run in terminal node index.js.