Node.js Send Email – Sending mail using Nodemailer

This article is shared to explain node.js send an email with an HTML template & SMTP through Gmail. You will get standard source code for sending mail using Nodemailer from the localhost or a live server.

As you know that Email is frequently used in web applications to communicate through the internet. It is mainly integrated into the contact us form & signup/ registration form to reach the customer directly, send a notification, & promote products/brands.

You will learn everything related to this topic through some simple steps. But you should have a basic knowledge of Node.js & express for a better understanding. Once you complete this article, you can easily write a script for your website to send an email in node.js.

node.js send email

Nodemailer Module

The Nodemailer Module allows a web application to send an email from the local computer or a server.

The Nodemailer is very simple to create an Email System in Node.js

You can easily install the Nodemailer module using the following NPM command

npm install nodemailer

After installing Nodemailer, You will have to include it in the Node.js app with the following script.

var nodeMailer = require('nodemailer');

Send Email Using Nodemailer

You have to configure the following points to send email using Nodemailer –

  • First all, include the Nodemailer module using require('nodemailer') and assign it to a variable nodeMailer
  • access the transporter from nodemailer with the following properties.
    • host: It accepts the only hostname.
    • port: assign port no 587 it, if the security property is false otherwise 465
    • secure: assign false to it, if you send an email from the localhost otherwise true for https:// server.
    • requireTLS: always keep it true
    • user: assign your valid email address to it.
    • pass: assign your valid email password to it
  • Declare an object mailMessage to store mail messages with the following properties
    • from: It accepts the sender’s email address.
    • to: It accepts the receiver’s email address.
    • subject: It accepts some subject text.
    • text: It accepts plain text for the message.
  • Access the sendMail from transporter and pass mailMessage & an anonymous function
var nodeMailer = require('nodemailer');
var transporter = nodeMailer.createTransport({
        host: 'hostname',
        port: 587,
        auth: {
          user: 'Enter your email address',
          pass: 'Enter your emaill password'
      var mailMessage = {
        from: 'sender email address',
        to: 'receiver email address',
        subject: 'Enter subject Text',
        text: 'Enter Email Message'
      transporter.sendMail(mailMessage, function(error, data){
        if (error) {
        } else {
          console.log('Email sent: ' + data.response);


Nodemailer multiple recipients

Nodemailer allows us to assign multiple recipients. So, you can assign multiple emails addresses to the property to with separated by a comma ,

var mailMessage = {
  from: 'sender email address',
  to: 'reciever email address 1, reciever email address 2, reciever email address 3,..',
  subject: 'Enter mail subject',
  text: 'Enter Mail Message'

Node.js Send Email with HTML template

If you need to send an email with an HTML template, you will have to declare html instead of text property with HTML tag & plain text.

var mailMessage = {
  from: 'sender email address',
  to: 'receiver email addres',
  subject: 'Enter mail subject',
  html: '<h1Some  heading text here</h1><p>Some paragraph text here</p>'

Node.js send an Email through Gmail

If you need to use a Gmail account to send an email using node.js, you have to assign it only to the host property. The remaining previous code will be the same.

You have to configure a basic setting in a google account if you send an email from a less secure server like or localhost. So, go through the following steps –

  • First of all, Open Google Account and sign in with a Gmail account that is assigned to auth property.
  • Click the security navigation link that remains at the left sidebar.
  • Scroll down and find out the Less secure app access box section.
  • Click turn on access and turn on with switch toggle button.

google account for sending mail in node.js

Now, Let’s understand it from the next steps with an example. once you learn it, you will be able to integrate a mailing system into your project.

How to send Email in Node.js

From this step, We will send an email from an HTML form in Node.js & expressjs. after learning it, you can easily configure it with the signup or contact us form. So, follow all the given steps

1. Install Node.js and Express Application

First of all, you have to install Node.js and express application. After installing them, you will get the following folder structure.

  |    |__email-route.js
  |    |
  |    |__email-form.ejs
  |    |

2. Install Nodemailer Module

Install Nodemailer Module by running the command –

npm install nodemailer

3. Create an Email form

Create a file email-form.ejs in the views folder and write the following HTML code to create an email form. Here the ejs is a template engine. This form must contain two attributes –

  • method=”post” – It will send secure email
  • action=”send-email” – It will redirect to the route send-email.

File Name – email-form.ejs

<!DOCTYPE html>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title><%= title %></title>
* {
  box-sizing: border-box;}
.user-detail {
    height: 100vh;
    border: 2px solid #f1f1f1;
    padding: 16px;
    background-color: white;
    width: 30%;}
input, textarea{
  width: 100%;
  padding: 15px;
  margin: 5px 0 22px 0;
  display: inline-block;
  border: none;
  background: #f1f1f1;}
input[type=text]:focus, input[type=password]:focus {
    background-color: #ddd;
    outline: none;}
button[type=submit] {
    background-color: #434140;
    color: #ffffff;
    padding: 10px 20px;
    margin: 8px 0;
    border: none;
    cursor: pointer;
    width: 100%;
    opacity: 0.9;
    font-size: 20px;}
  font-size: 18px;;}
button[type=submit]:hover {
<!--====form section start====-->
<div class="user-detail">
    <h2>Send mail with nodejs</h2>
    <form action="/send-email" method="POST">
          <input type="text" placeholder="Receiver Email" name="to" required >
          <input type="text" placeholder="Enter Email Address" name="subject" required >
          <textarea placeholder="Enter Full Country" name="message" required >
          <button type="submit">Send and Email</button>
<!--====form section start====-->


4. Write Send Email Script

Create a route file email-route.js in the routes folder and configure the following points to write the send email script –

  • Include express package using  require('express') and assign it to a variable express.
  • Access router method from the express as express.Router() and assign it to a variable router.
  • Include Nodemailer module using  require('nodemailer') and assign it to a variable naodemailer.
  • Create a send-email route using the get method and load email form file email-form .
  • Also, create another send-email route using the post method and write send email script 
  • At last, export router module using module.exports = router;

File Nameemail-route.js

var express = require('express');
var router = express.Router();
var nodemailer = require('nodemailer');

// load email form
router.get('/send-mail', function(req, res, next) {
  res.render('mail-form', { title: 'Send Mail with nodejs' });

// This route will work after submit the form'/send-email', function(req, res){
    var receiver =;
    var subject = req.body.subject;
    var message = req.body.message;
    var transporter = nodemailer.createTransport({
        host: '',
        port: 587,
        auth: {
          user: '', // enter your email address
          pass: '********'  // enter your visible/encripted password
      var mailOptions = {
        from: '',
        to: receiver,
        subject: subject,
        text: message
      transporter.sendMail(mailOptions, function(error, info){
        if (error) {
        } else {
          console.log('Email was sent successfully: ' + info.response);
      res.render('mail-form', { title: 'Send Mail with nodejs' });
module.exports = router;


5. Include Route File in app.js

In the previous step, we have created a route file email-route.js . Now, you have to include it in the app.js using the following line of code –

File Name – app.js


var emailRouter = require('./routes/email-route');
app.use('/', emailRouter);

6. Execute Send Email Script

At last, you can execute the send email script by doing the following steps –

  • Start node.js using the command npm start
  • Open the following URL in your browser.
  • Enter a receiver email address, subject & message in the form.
  • Submit the form to send an email.

After doing the above steps, an email will be sent successfully

Tutorial Summary

Dear developers, I hope you have understood the above script, Now you can easily send an email using Node.js & expressjs.

If you have any questions regarding Node.js. You can directly ask me through the below comment box. Even share this tutorial with your friends.