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 it is Azure or Windows box.
• It also comes with Custom Plugin support for manipulating messages.

In order to send an email, create a file named index.js and write down the following code: 

Filename: index.js

javascript

const nodemailer = require("nodemailer");

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

let 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 receivers?

Well in that case just add the below code to 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 the below code to 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 the below code to your mail function: 

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

The final index.js file looks like this: 

Filename: index.js

javascript

let nodemailer = require("nodemailer");

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

let 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);
    }
});