Node.js Email

To send emails programmatically is a common requirement for web applications, whether for sending transactional emails, newsletters, or notifications. Node.js with its vast ecosystem offers several ways to achieve this.With Nodemailer as one of the most popular and straightforward methods. This article will guide you through the process of sending emails using Node.js that covers the basics of the Nodemailer module. To send emails to single and multiple recipients, and designing emails with HTML content.

The Nodemailer Module

Nodemailer is a module for Node.js applications to allow easy email sending. The beauty of Nodemailer lies in its simplicity and flexibility offers a range of options from using local SMTP servers to integrating with major email service providers like Gmail, Outlook, and many more.

To get started, you need to install Nodemailer in Node js project. This can be done using Nodemailer npm (Node package manager). Open your terminal, navigate to your project directory, and run the following command:

npm install nodemailer

Once installed, you can require Nodemailer in your project like so:

const nodemailer = require('nodemailer');

Send an Email

To send an email, you first need to create a transporter object. This object is essentially your email server configuration. For demonstration purposes, let’s use Gmail. Note that to use Gmail for sending emails, you might need to enable “Less secure app access” in your Google account settings, or better yet, use OAuth2 for authentication which is more secure but beyond the scope of this basic introduction.

Here’s how you can create a transporter and send an email:

let transporter = nodemailer.createTransport({
  service: 'gmail',
  auth: {
    user: '',
    pass: 'yourgmailpassword'

let mailOptions = {
  from: '',
  to: '',
  subject: 'Hello from Node.js',
  text: 'This is a plain text email sent from Node.js using Nodemailer.'

transporter.sendMail(mailOptions, function(error, info){
  if (error) {
  } else {
    console.log('Email sent: ' + info.response);

Multiple Receivers

Sending emails to multiple recipients is as straightforward as sending to a single recipient. All you need to do is specify the recipients in the to field of the mailOptions object, separating each email address with a comma:

to: ',,',

This will send the same email to all listed recipients.


Nodemailer in Node.js allows you to go beyond plain text emails by supporting HTML content. This means you can send rich, formatted emails which are much more engaging for the recipient. You simply need to use the html field instead of the text field in your mailOptions:

let mailOptions = {
  from: '',
  to: '',
  subject: 'Hello from Node.js',
  html: '<h1>Welcome</h1><p>This is an HTML email sent from <strong>Node.js</strong> using Nodemailer.</p>'

Nodemailer Node Js module with HTML content allows you to include images, links, different fonts, and much more, making your emails look professional and engaging.

Security and Best Practices

When using Nodemailer (or any email sending service), it’s crucial to keep security in mind:

  • Avoid Hard-Coding Credentials: Hard-coding your email service credentials in your codebase can be risky, especially if your code is public. Use environment variables or secure vaults to store sensitive information.
  • Use OAuth2 with Gmail: If you’re using Gmail as your email service provider, it’s recommended to use OAuth2 for authentication instead of enabling “Less secure app access.”
  • Rate Limits and Spam: Be aware of the sending limits and spam filters of your email service provider. Sending a large number of emails in a short period can lead to your emails being flagged as spam or your account being suspended.


Send Emails in Node.js application is a relatively simple process, thanks to modules like Nodemailer. Whether you’re sending a quick notification, a newsletter, or a rich HTML email, Nodemailer offers the flexibility and simplicity to get the job done. Remember to follow best practices, especially regarding security and email provider policies, to ensure your emails reach their intended recipients without issue.

By mastering the basics of Node.js send Emails module, you’ll add a valuable skill to your web development toolkit, enhancing the functionality and user experience of your applications. Happy coding!