How to use API based providers for sending OTP in Node.js

Source: Dev.to

Setup

Install the required library from npm:

npm install auth-verify

Configuration

const AuthVerify = require('auth-verify');
const auth = new AuthVerify();

// Configure the OTP sender
auth.otp.sender({
  via: 'email',
  service: 'api',
  apiService: 'resend',   // Change to 'mailgun', 'sendgrid', etc. as needed
  apiKey: 'YOUR_API_KEY_HERE'
});

Sending OTP

await auth.otp.send('johndoe@example.com', {
  otpLen: 5,                     // Length of OTP codes (default: 6)
  subject: 'Account verification',
  text: `Your OTP code is ${auth.otp.code}`
});

Verifying OTP

const valid = await auth.otp.verify('johndoe@example.com', '12345');

if (valid) {
  console.log('User verified!');
} else {
  console.log('Invalid code!');
}