I have made a simple task manager need to include to small features into it in mean stack

Hey, So, I have made a simple mean stack application and I have made a few APIs in the backend following a tutorial as much as I could. Now, I am looking for just three more features in it, 1. I also need to present Google Recaptcha while people try to sign up more than thrice in a day from the same IP address by saving it to the mongo DB. 2. Logout a person from the session. 3. Accept one more field from the sign-up form and show it in the frontend. (Although, I can do this myself just putting it out here.