How to send OTP codes with SMS in Node.js

Sending OTP (One-Time Password) is one of the most common tasks when building modern apps — signup verification, login security, password reset, etc.

In Node.js it’s extremely easy to implement — you just need an SMS provider (like Twilio) and library like auth-verify for generating, saving and checking user codes.

So we should install essential library (we'll only use auth-verify for whole process and we don't need any other libaries)

npm install auth-verify

And then we'll create index.js like this:

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

auth.otp.setSender({
   via: 'sms',
   provider: 'twilio',
   apiKey: "YOUR_ACCOUNT_SID",
   apiSecret "YOUR_AUTH_TOKEN",
   sender: "SENDER_NAME",
   mock: false // If you want to just test you can change this value to true
});

You can get accountsid and authtoken from here. And you should use your accountsid and authtoken for apiKey and apiSecret in auth-verify.
apiKey→ accountsid
apiSecret→ authtoken
And then we'll generate and save OTP code for sending with SMS

auth.otp.generate(5).set("RECIEVER_NUMBER", (err)=>{
   if(err) console.log(err);
   auth.otp.message({
      to: "RECIEVER_NUMBER",
      text: `Your OTP code is ${auth.otp.code}`
   });
});

So we made OTP code and saved it to in-memory. Let's check and verify OTP code.

auth.otp.verify({check: "RECIEVER_NUMBER", code: "12345"}, (err, valid)=>{
   if(err) console.log(err);
   if (valid) console.log("Correct code!")'
   else console.log("Incorrect code!");
});

So we finally did it!