This project provides a complete Node.js implementation of Time-Based One-Time Password (TOTP) compatible with Google Authenticator. It generates a Base32-encoded secret, produces an OTP Auth URL, displays a QR code in the terminal, and verifies OTP codes entered by users with configurable retry limits.

• 🔑 Generate secure Base32-encoded TOTP secret key
• 🔗 Create OTP Auth URL for Google Authenticator
• 📟 Display QR code directly in terminal (no browser needed)
• ✅ Validate TOTP codes entered by user with up to 3 retry attempts
• ⚡ No external TOTP libraries (pure Node.js + standard packages)

git clone https://github.com/NeaByteLab/TOTP-Generator.git
cd TOTP-Generator

npm install

node index.js

1. 🔑 The app generates a TOTP secret key.
2. 🔗 It creates an OTP Auth URL and displays the QR code in the terminal.
3. 📲 You scan the QR code using Google Authenticator or compatible app.
4. ⌨️ The app prompts you to enter the 6-digit code.
5. 📝 The app verifies the entered code and informs whether it is valid or invalid.
6. ♻️ You have up to 3 attempts by default.

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Enter OTP: 123456
 -> OTP Invalid
Enter OTP: 654321
 -> OTP Invalid
Enter OTP: 789012
 -> OTP Valid

• crypto — For secure random key generation
• qrcode — For generating QR code data
• qrcode-terminal — To render QR code in terminal
• readline-sync — For synchronous terminal input

MIT License © 2025 NeaByteLab