How to delete all users from Firebase

#firebase #serverless #googlecloud

Sometimes we need to wipe out our entire Firestore database. When that happens, it might also be useful to delete all existing users from the Firebase console.

As far as I know, we can't do that using the CLI. However, we can create a Cloud Function with an HTTPS trigger to delete all users:

export const deleteUsers = functions.https.onRequest(
  async (req, res): Promise<any> => {
    const allUsers = await auth.listUsers();
    const allUsersUID = allUsers.users.map((user) => user.uid);
    return auth.deleteUsers(allUsersUID).then(() => res.send("deleted"));
  }
);