(Node.js) Send HTML Email with Attachments

Demonstrates how to send an HTML email with file attachments.

Install Chilkat for Node.js and Electron using npm at

Chilkat npm packages for Node.js
Chilkat npm packages for Electron
on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var mailman = new chilkat.MailMan();

    mailman.SmtpHost = "smtp.my-starttls-mail-server.com";

    mailman.SmtpUsername = "MY-SMTP-USERNAME";
    mailman.SmtpPassword = "MY-SMTP-PASSWORD";

    mailman.StartTLS = true;
    mailman.SmtpPort = 587;

    // Create a new email object
    var email = new chilkat.Email();
    email.Subject = "Test SMTP API to Send HTML Email with Attachments";
    email.From = "Joe Programmer <joe@my-starttls-mail-server.com>";
    email.AddTo("Chilkat Support","support@chilkatsoft.com");

    // Add a plain-text alternative body, which will likely never be seen.
    // (It is shown if the receiving email client is incapable of displaying HTML email.)
    email.AddPlainTextAlternativeBody("This is a plain-text alternative body...");

    // Our HTML will include an image, so add the related image here.
    var contentIdStarfish = email.AddRelatedFile("qa_data/jpg/starfish.jpg");
    if (email.LastMethodSuccess !== true) {
        console.log(email.LastErrorText);
        return;
    }

    // The src attribute for the image tag is set to the contentIdStarfish:
    var sbHtml = new chilkat.StringBuilder();
    sbHtml.Append("<html><body><p>This is an HTML email with an embedded image.</p>");
    sbHtml.Append("<p><img src=\"cid:CONTENT_ID_STARFISH\" /></p></body></html>");
    var numReplacements = sbHtml.Replace("CONTENT_ID_STARFISH",contentIdStarfish);

    email.AddHtmlAlternativeBody(sbHtml.GetAsString());

    // Finally, add some attachments to the email.
    // Add a file attachment.
    var success = email.AddFileAttachment2("qa_data/pdf/fishing.pdf","application/pdf");
    if (success !== true) {
        console.log(email.LastErrorText);
        return;
    }

    // Add an attachment where the content is contained in a string.
    var content = "This is the content of the 2nd attached file.";
    email.AddStringAttachment("someText.txt",content);

    // Send the HTML email.
    success = mailman.SendEmail(email);
    if (success !== true) {
        console.log(mailman.LastErrorText);
        return;
    }

    success = mailman.CloseSmtpConnection();
    if (success !== true) {
        console.log("Connection to SMTP server not closed cleanly.");
    }

    console.log("HTML email with attachments sent!");

}

chilkatExample();