How to send Attachments and Email using nodemailer in Node.js ?

For this purpose, we will use a package called nodemailer. It is a module that makes email sending pretty easy. For using it, you will need to install by using the following command: 

$ npm install nodemailer

Features of nodemailer module:

• It has zero dependencies and heavy security.
• You can use it hassle free whether its Azure or Windows box.
• It also comes with Custom Plugin support for manipulating messages.

Inorder to send email, create a file named index.js and write down the following code: 
Filename: index.js

javascript

var nodemailer = require("nodemailer");

var sender = nodemailer.createTransport({
  service: 'gmail',
  auth: {
    user: 'username@gmail.com',
    pass: 'your_password'
  }
});

var mail = {
  from: "username@gmail.com",
  to: "receiver's_username@gmail.com",
  subject: "Sending Email using Node.js",
  text: "That was easy!"
};

sender.sendMail(mail, function(error, info) {
  if (error) {
    console.log(error);
  } else {
    console.log("Email sent successfully: "
                 + info.response);
  }
});

Steps to run this program: In order to run this file, just Git Bash into your working directory and type the following command: 

$ nodemon index.js

If you don’t have nodemon installed then just run the following command: 

$ node index.js

To double-check its working you can go to the receiver’s mail and you will get the following mail as shown below: 

What if you have multiple receiver?
Well in that case just add below code in your mail function: 

to: 'first_username@gmail.com, second_username@gmail.com'

What if you want to send HTML formatted text to the receiver?
Well in that case just add below code in your mail function: 

html: "<h1>GeeksforGeeks</h1><p>I love geeksforgeeks</p>"

What if you want to send an attachment to the receiver?
Well in that case just add below code in your mail function: 

attachments: [
    {
      filename: 'mailtrap.png',
      path: __dirname + '/mailtrap.png',
      cid: 'uniq-mailtrap.png' 
    }
  ]

The final index.js file look like this: 
Filename: index.js

javascript

var nodemailer = require("nodemailer");

var sender = nodemailer.createTransport({
    service: 'gmail',
    auth: {
        user: 'username@gmail.com',
        pass: 'your_password'
    }
});

var mail = {
    from: 'username@gmail.com',
    to:
'first_username@gmail.com, second_username@gmail.com',
    subject: 'Sending Email using Node.js',
    text: 'That was easy!',
  html:
"<h1>GeeksforGeeks</h1>
<p>I love geeksforgeeks</p>
",
  attachments: [
        {
            filename: 'mailtrap.png',
            path: __dirname + '/mailtrap.png',
            cid: 'uniq-mailtrap.png'
        }
    ]
};

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