email-verify with nodejs

email-verify.js

const dns = require('dns');
const mailcheck = require('mailcheck');

const isDomainMXValid = (domain) => {
  return new Promise((resolve, reject) => {
    dns.resolveMx(domain, (err, mxs) => {
      if (err) {
        reject(err);
      }
      resolve(!!(mxs && mxs.length > 0 && mxs[0].exchange));
    });
  });
};

const isEmailValid = (email) => {
  return /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,})+$/.test(email);
};

const getSuggestionForEmail = (email) => {
  return new Promise((resolve, reject) => {
    mailcheck.run({
      email,
      // domains: domains,                       // optional
      // topLevelDomains: topLevelDomains,       // optional
      // secondLevelDomains: secondLevelDomains, // optional
      // distanceFunction: superStringDistance,  // optional
      suggested: function(suggestion) {
        resolve(suggestion);
      },
      empty: function() {
        resolve('');
      }
    });
  });
};

const verifyEmail = async (email) => {
  if (!isEmailValid(email)) {
    return false;
  }
  const split = email.split('@');
  if (split.length === 2) {
    try {
      return await isDomainMXValid(split[1]);
    } catch (error) {
      // console.log(error);
      return false;
    }
  }
  return false;
}

// isDomainMXValid('iamlanistar.com').then(r =>{
//   console.log(r);
// });

// const email = 'user@not-existed-domain.com';
const email = 'user@hotmal.com';

verifyEmail(email).then(isValid =>{
  console.log(`${email} is ${isValid}`);
});

getSuggestionForEmail(email).then(suggestion => {
  if (suggestion) {
    console.log(`${email} looks slappy here is the suggestion: ${suggestion.full}`);
    return;
  }
  console.log(`there is no suggestion for ${email}`);
})

package.json

{
  "name": "email-verif",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "mailcheck": "^1.1.1"
  }
}