How to Send OTP via API in Node.js (Step-by-Step Guide)

How to Send OTP via API in Node.js (Step-by-Step Guide)

Sending OTP (One-Time Password) messages is a critical feature for modern applications like user authentication, payments, and account verification. In this guide, you’ll learn how to send OTP via API in Node.js using smsgatewayhub.com.

🚀 Prerequisites

Before you start, make sure you have:

A Node.js environment installed

An active account on smsgatewayhub.com

Your API key (provided in your dashboard)

A verified sender ID

📦 Step 1: Install Required Package

We’ll use axios to send HTTP requests.

npm install axios

🔑 Step 2: Understand the API Endpoint

Typically, an SMS API requires:

API Key

Mobile Number

Message Content (OTP)

Sender ID

Example API endpoint (replace with your actual one) refer : https://www.smsgatewayhub.com/free-sms-gateway-developer-api

💻 Step 3: Node.js Code to Send OTP

Here’s a simple example:

const axios = require('axios'); const sendOTP = async (mobile, otp) => {  try {    const response = await axios.post('https://smsgatewayhub.com/send', {      apiKey: 'YOUR_API_KEY',      number: mobile,      message: `Your OTP is ${otp}`,      senderId: 'SMGHUB'    });    console.log('OTP sent successfully:', response.data);  } catch (error) {    console.error('Error sending OTP:', error.response?.data || error.message);  } }; // Example usage sendOTP('919876543210', '123456');

🔐 Step 4: Generate OTP Securely

Use a secure OTP generator:

const generateOTP = () => {  return Math.floor(100000 + Math.random() * 900000); };

⚡ Step 5: Best Practices

OTP should expire in 2–5 minutes

Never store OTP in plain text

Use HTTPS APIs only

Implement rate limiting to prevent abuse

📊 Step 6: Handle API Responses

Make sure your API returns:

Success status

Message ID

Error codes (if failed)

Example:

{  "status": "success",  "messageId": "abc123" }

🧪 Step 7: Test Your Integration

Test with multiple numbers

Check delivery speed

Verify OTP accuracy

Monitor failures

🎯 Conclusion

Integrating OTP SMS in Node.js using smsgatewayhub.com is straightforward. With proper implementation and security practices, you can ensure reliable and fast OTP delivery for your users.

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