Build an OTP Verification System in JavaScript (Secure Login Logic)
Build a real-world OTP Generator & Verification system using Vanilla JavaScript.
Learn how secure logins verify users, expire OTPs, and prevent unauthorized access.
👉 Full source code on GitHub | Week 8 of 52 JavaScript Projects
🚀 What You’ll Build
In this project, you’ll build a One-Time Password (OTP) Generator & Verification system using HTML, CSS, and Vanilla JavaScript.
This is not just random numbers.
You’ll learn how to:
Generate secure OTP values
Simulate OTP delivery
Handle OTP expiration
Enable/disable verification states
Validate user input correctly
Build authentication-style UI logic
This project mirrors real login & verification flows used in production apps.
⏱️ Chapters (Outcome-Based)
00:00 – Why OTP Authentication Matters
00:33 – OTP Verification Demo
03:29 – Project Setup
04:43 – OTP UI Structure
07:40 – OTP UI Styling
12:00 – DOM & State Setup
14:00 – Generate Secure OTP
15:08 – OTP Expiration Logic
16:29 – Enable/Disable States
22:59 – Auto Send OTP Logic
24:00 – Verify OTP Function
26:50 – Reset & Cleanup Logic
30:15 – Manual Testing
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📂 Check out the source code for this project on GitHub!
👉 [https://github.com/codehuntersharath/...]
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