An application that uses a one-time password (OTP) to validate users' email addresses and phone numbers.
Demo

The application uses nodejs and MongoDB in the backend. When the user hits the /register route with his/her email address/phone number

1. The controller saves the user data in the database.
2. Generates and saves the OTP with userId in the database.
3. With help of regular expression, it checks whether the given input is an email address or a phone number and sends the OTP accordingly to it, after that sending back the response to the client.
4. Client receives OTP, enters it, and hit the /verify route. If it is correct, the controller updates the database. If it is invalid, the controller will inform the client.

• Default view
• If user already exists
• Registering a new user

OTP sent to email address

If entered the wrong OTP

Email verified

• Same goes for phone number

In the database, verified field is updated to true upon successful verification.

Note: email field in the database is used interchangeably to store email and phone number.