Developers can implement a secure One-Time Password system in Node.js using the auth-verify library. This tutorial outlines a step-by-step process for creating endpoints to request and verify OTP codes. The package simplifies generation, delivery via email or SMS, and includes built-in security features like cooldowns, which are essential for preventing brute-force attacks during authentication flows.

Setting up the project involves installing express, auth-verify, and dotenv. Configuration is handled through a `.env` file, where sensitive details like SMTP credentials are stored. The core logic involves initializing the AuthVerify instance and defining an email sender. This approach abstracts away the complexity of managing token expiration and storage, letting developers focus on the user-facing authentication logic.

Two primary routes are established: `/send-otp` to generate and dispatch a code, and `/verify-otp` to check user submissions. The `auth-verify` library handles the underlying verification, returning a simple boolean. Adding a cooldown period between requests is a critical security measure, mitigating spam and protecting against credential stuffing attempts common in modern web applications.