send-dynamic-email-templates.js

import express, { Application , Request, Response} from 'express';
import nodemailer from "nodemailer";
import handlebars from "handlebars";


const transporter = nodemailer.createTransport({
  host: 'smtp.ethereal.email',
  port: 587,
  secure: false,
  requireTLS: true,
  auth: {
    user: 'email',
    pass: 'password',
  },
  logger: true
});

const app: Application = express();

const port: number = 8000

app.get('/', async (req: Request, res: Response) => {
  const filePath = path.join(__dirname, '../emails/template.html');
  const source = fs.readFileSync(filePath, 'utf-8').toString();
  const template = handlebars.compile(source);
  const replacements = {
      username: "Darth Vader"
  };
  const htmlToSend = template(replacements);

  const info = await transporter.sendMail({
    from: '"Sender Name" <from@example.net>',
    to: "email.address@gmail.com",
    subject: "Hello from node",
    text: "Hello world?",
    html: htmlToSend,
    headers: { 'x-myheader': 'test header' }
  });

  console.log("Message sent: %s", info.response);
  res.send('Hello world!')
})

app.listen(port, function () {
  console.log(`App is listening on port ${port} !`)
})