This is a simple Node.js and Express application that demonstrates two-factor authentication (2FA) using Speakeasy, MongoDB for user storage, and QR codes for setup.

Before running the application, make sure you have the following installed:

• Node.js
• MongoDB

1. Clone the repository:

   git clone https://github.com/yourusername/2fa-application.git

2. Install dependencies:

   cd 2fa-application
   npm install

3. Start the application:

   node index.js

   The server will be running on http://localhost:3000.

1. Open your browser and go to http://localhost:3000.
2. Fill in the registration form to register a new user. The server will provide a QR code for 2FA setup.
3. Use an authenticator app (e.g., Google Authenticator) to scan the QR code and generate OTPs.
4. Fill in the verification form with your username and the OTP generated by the authenticator app to verify.

• This is a basic example for sample backend purposes. In a production environment, additional security measures and considerations should be implemented.

• Make sure to secure your MongoDB connection and handle errors more gracefully in a real-world scenario.

• The application is configured to connect to a MongoDB database named 2fa-example. Adjust the connection URI in index.js if needed.

This project is licensed under the MIT License - see the LICENSE file for details.