Node.js OTP Email Verification using Nodemailer & Express | Gmail SMTP Tutorial
Learn how to build a complete OTP Email Verification System using Node.js, Express.js, and Nodemailer with Gmail SMTP.
In this tutorial, we create:
Send OTP API
Verify OTP API
Gmail SMTP setup
Nodemailer integration
Express backend routes
Temporary OTP storage
JSON API testing
Perfect for beginners learning backend development, authentication systems, and email verification APIs.
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Topics Covered:
• Node.js OTP Authentication
• Express.js Backend
• Nodemailer Tutorial
• Gmail SMTP Setup
• Send OTP to Email
• Verify OTP API
• REST API Development
• Backend Authentication System
• Email Verification using Node.js
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Gmail SMTP & App Password Process
1. Open your Google Account
2. Go to Security
3. Enable 2-Step Verification
4. Search “App Passwords”
5. Create a new app password
6. Copy the generated 16-digit password
7. Use it inside Nodemailer SMTP auth
Example:
user: [[email protected]](mailto:[email protected])
pass: your_generated_app_password
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Tech Stack
• Node.js
• Express.js
• Nodemailer
• Gmail SMTP
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Packages Used
npm install express nodemailer
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This project is useful for:
• Login/Register Systems
• Authentication APIs
• MERN Stack Projects
• College Projects
• Production Backend Systems
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