Getting Started with OTP Authentication in Modern Web Apps

Source: Dev.to

Why OTP Authentication Matters

• Verifies user identity during login or signup
• Prevents fake account creation
• Adds an extra layer of security
• Commonly used in banking, SaaS platforms, and secure APIs

How OTP Works

One‑Time Password (OTP) authentication is a method of verifying a user’s identity by sending a short‑lived code to a trusted channel (e.g., SMS, email, or an authenticator app). The user must provide this code during login, registration, or a sensitive transaction, ensuring that only the legitimate owner can complete the action.

Implementation Options

Developers can implement OTP using:

• SMS – Send the code via text message to the user’s phone number.
• Email – Deliver the code to the user’s registered email address.
• Authenticator Apps – Generate time‑based codes (e.g., Google Authenticator, Authy) that the user reads from an app.

Example Visual