Script to delete all firebase users using firebase admin SDK

firebase-delete-all-users.js

const admin = require('firebase-admin');
admin.initializeApp();

function deleteAllUsers(nextPageToken) {
    admin.auth().listUsers(10, nextPageToken)
        .then(function(listUsersResult) {
            listUsersResult.users.forEach(function(userRecord) {
                admin.auth().deleteUser(userRecord.uid).then(() => {
                    console.log(`deleted ${userRecord.uid}`);
                });
            });
            if (listUsersResult.pageToken) {
                setTimeout(() => {
                    deleteAllUsers(listUsersResult.pageToken)
                }, 1000);
            }
        })
        .catch(function(error) {
            console.log(error);
        });
}
deleteAllUsers();