Send email via mailgun using NodeJS standard library

send_email_mailgun_nodejs.js

const https = require('https');
const qs = require('querystring');

const MAILGUN_API_TOKEN = '<api-token>';
const MAILGUN_API_PATH = '<api-path>'; // API url without hostname
const MAILGUN_FROM_EMAIL = '<from@email.com>';

const options = {
  hostname: 'api.mailgun.net',
  path: MAILGUN_API_PATH,
  method: 'POST',
  headers: {
    'Content-Type': 'application/x-www-form-urlencoded',
  },
  auth: 'api:' + MAILGUN_API_TOKEN,
}

const req = https.request(options, (res) => {
  let result = '';
  res.on("data", (b) => {
    result += b.toString();
  });
  res.on('end', () => {
    console.log('result :', result);
  });
});

req.on('error', (err) => {
  console.log('err :', err);
});

const payload = qs.stringify({
  from: MAILGUN_FROM_EMAIL,
  to: 'to@email.com',
  subject: "Ahoy, man!",
  text: 'YoYoYo!',
});

req.write(payload)
req.end();