This document discusses how to send emails from a Node.js application using Nodemailer. It explains that Nodemailer is a popular module for sending emails and describes how to set up Nodemailer with either a Mailtrap or Gmail account. The document provides step-by-step instructions for sending basic text emails, HTML emails, and emails with attachments from a Nodemailer application.

1. NodeMailer Example:
How to Send Email
using NodeMailer
with Gmail & Mailtrap
www.bacancytechnology.com

2. Ways of communication have evolved
over the years. And sending email is
considered the most professional and
widely used feature in the web area.
Emails are used for interacting and
communicating with your customers so
that they don’t miss any important
updates.

3. Introduction

4. Most of all, the applications use email as their
feature for communicating with the users. Have
you ever thought about how applications send
emails? If you are looking for an answer for
your ‘how,’ then you’re at the right place!
In this tutorial, we will learn how to send emails
from the Node.JS app with the help of
NodeMailer. With the help of the NodeMailer
example, we will cover sending emails with
basic HTML content and attachments.
For setting up the fake SMTP server, we can use
Mailtrap or Gmail accounts. In this blog, we will
learn how to send email using NodeMailer with
both- Mailtrap and Gmail accounts; you can
prefer whichever you want to.

5. What is
NodeMailer?

6. Zero dependencies on other modules
Secure emails delivery
HTML content or embedded attachments
Unicode support
Various transport options besides SMTP
NodeMailer is the most famous module used for
sending and receiving emails from NodeJS
applications. It is a zero dependency module for
your NodeJS apps.
You can easily send emails as plain text, HTML,
or attachments (image, document, etc.).
Here are some of the features of NodeMailer
that makes it best and popular-
Let’s start with our NodeMailer example and
learn how to send email using NodeMailer.

7. NodeMailer
Example: How
to Send Email
using
NodeMailer

8. There are innumerable modules and packages
available for sending emails. From them,
NodeMailer is said to be the most favorable and
famous that allows you to send emails hassle-
free.
Follow this step-by-step guide for developing a
demo application and implement NodeMailer in
your NodeJS application.
Step 1: Getting Started
Create a new directory and run the npm init
command for generating the package.json file.
Use these below commands:
$ mkdir nodejs-email
$ cd nodemailer
$ npm init -y

9. Step-2: Install dependencies
Install the NodeMailer module using npm:
$ npm install nodemailer
Install the dotenv package to store user
credentials.
$ npm install dotenv
Create a file named .env having two variables:
EMAIL_USERNAME– For account ID
EMAIL_PASSWORD– For password

10. Create an app.js file in the directory for the
NodeMailer end-point. To keep it simple, we
will write the complete code in app.js.
You require the below syntax for loading
packages:
require('dotenv').config();
const nodemailer = require('nodemailer');
Step-3: Using SMTP for
Nodemailer Transport
SMTP (Simple Mail Transfer Protocol) is used to
send emails between various servers. Almost all
the email systems are SMTP-based for sending
emails over the Internet.

11. let transport =
nodemailer.createTransport(options[, defaults])
options – It is an object that is used to connect
with any host.
defaults – It is an object combining into each
message object. With its help, you can define
shared options, e.g., setting the default address
for email.
Nonetheless, for sending a message via our
transport, configuring the connection must.
Moving forward in our NodeMailer example.

12. Create a brand new Mailtrap account
Create new inbox
Get your credentials
Step:4 Connection with
Mailtrap Account
We can use Mailtrap- a dummy SMTP server.
Rather than testing the demo with your mail
and piling the inbox with test and unwanted
emails, use Mailtrap as an end-point.
If you don’t have a Mailtrap account, follow
these steps-
Later use the credentials into nodemailer’s
transport object.

13. let transport = nodemailer.createTransport({
host: 'smtp.mailtrap.io',
port: 2525,
auth: {
user: process.env.EMAIL_USERNAME,
pass: process.env.EMAIL_PASSWORD
}
});
Keep your username and password inside the
.env file and use it here.
Step:5 Connection with Gmail
Account
In case you want to use your Gmail account use
the below code snippet. Keep the credentials
into the transport object.

14. let transport = nodemailer.createTransport({
host: "smtp.gmail.com",
port: 465,
secure: true,
auth: {
user: process.env.EMAIL_USERNAME,
pass: process.env.EMAIL_PASSWORD
}
});
port – if secure is false, it uses 587, by default,
and 465 if true
host – it’s an IP address/hostname for
connecting to (by default to ‘localhost’)
auth – it defines authentication data
We have discussed both connections over here-
Mailtrap and Gmail. You can use any one
transport connection at a time for sending an
email.

15. Step: 6 Sending an Email with
Text
const mailOptions = {
from: 'sender@gmail.com', // Sender address
to: 'receiver@gmail.com', // List of recipients
subject: 'Node Mailer', // Subject line
text: 'Hello People!, Welcome to Bacancy!', //
Plain text body
};
transport.sendMail(mailOptions, function(err,
info) {
if (err) {
console.log(err)
} else {
console.log(info);
}
});
Note: Before sending an email from your Gmail
account, allow non-secure apps for accessing
your Gmail account. For that,

16. Go to your Gmail account settings.
Enable less secure apps for sending emails
from NodeMailer.
These are fields of the email:
from – Sender’s email address.
to – It is a comma-separated list of emails or an
array of senders’ email ID
subject – Email’s subject
text – The plaintext version of the message (
Buffer, Unicode string, Stream, or an
attachment: ({path: ‘/var/data/…’}))
Now moving towards the final section to send
an email. For that, we will use the sendMail()
method provided by the transport object that
we’ve created above.

17. mailOptions
callback function- It will be called when
either email is successfully sent or gives an
error.
The sendMail() method will take two
arguments:
Output- Here is the Text Email sent through
NodeMailer.

18. const mailOptions = {
from: 'sender@gmail.com', // Sender
address
to: 'receiver@gmail.com', // List of
recipients
subject: 'Node Mailer', // Subject line
html: '<h1 style="color:#ff6600;">Hello
People!,
Welcome to Bacancy!</h1>',
attachments: [
{ filename: 'profile.png', path:
'./images/profile.png' }
]
};
Step:7 Sending an Email with
HTML and Attachment
Use the below code snippet for sending an email
with HTML and attachments.

19. transport.sendMail(mailOptions, function(err,
info) {
if (err) {
console.log(err)
} else {
console.log(info);
}
});
The email contains two fields:
html – The HTML part contains a Buffer,
Unicode string, Stream, or an attachment:
({path: ‘http://…’})
attachments – An array of attachments’ objects.
Attachments can be used for embedding pdf,
images, documents, and many more.

20. Output- Here is the HTML Email with an
attachment sent through NodeMailer.

21. Conclusion

22. So, this was about how to send email using
NodeMailer. I hope the tutorial has assisted you
the way you have expected. You can also try
building the demo application from scratch
with us, add NodeMailer, and start learning!
And don’t forget to explore the NodeMailer
documentation.
If you’re a NodeJS enthusiast, then feel free to
visit NodeJS tutorials, where we have more
tutorials with respective Github repositories
that you can clone and play around with.
Bacancy has skilled developers with
fundamental and advanced NodeJS
development. If you are looking for
consummate NodeJS developers, then without
wasting a minute, contact Bacancy and Hire
NodeJS developers.

23. Thank You
www.bacancytechnology.com