Building a Serverless OTP System with n8n

Why Serverless OTP?

Traditional OTP systems require a backend server running 24/7. That means monthly costs, server maintenance, and scaling headaches. But what if you could build the same thing for ₹0/month?

In this guide, we'll build a complete email-based OTP verification system using:

Architecture Overview

The system works in three steps:

1. User enters their email

2. n8n generates a 6-digit OTP, stores it in Firestore, and triggers EmailJS

3. User enters the OTP, frontend verifies it against Firestore

**Pro Tip:** This same architecture can be adapted for SMS OTP using Twilio instead of EmailJS.

Step 1: Setting Up n8n Workflow

First, create a new workflow in your n8n instance...

Full tutorial content will be added here

Key Takeaways