(Node.js) Download Unread Email from IMAP Mailbox

Download unread email messages from an IMAP mailbox.

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

    var imap = new chilkat.Imap();

    // Connect to an IMAP server.
    // Use TLS
    imap.Ssl = true;
    imap.Port = 993;
    var success = imap.Connect("imap.someMailServer.com");
    if (success !== true) {
        console.log(imap.LastErrorText);
        return;
    }

    // Login
    success = imap.Login("admin@chilkatsoft.com","myPassword");
    if (success !== true) {
        console.log(imap.LastErrorText);
        return;
    }

    // Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox");
    if (success !== true) {
        console.log(imap.LastErrorText);
        return;
    }

    // messageSet: MessageSet
    var messageSet;
    var fetchUids = true;

    // Find emails marked as seen or not already seen:
    var seenSearch = "SEEN";
    var notSeenSearch = "NOT SEEN";

    // Get the set of unseen message UIDs
    messageSet = imap.Search(notSeenSearch,fetchUids);
    if (imap.LastMethodSuccess == false) {
        console.log(imap.LastErrorText);
        return;
    }

    // Fetch the unseen emails into a bundle object:
    // bundle: EmailBundle
    var bundle;
    bundle = imap.FetchBundle(messageSet);
    if (imap.LastMethodSuccess == false) {

        console.log(imap.LastErrorText);
        return;
    }

    // Display the Subject and From of each email.
    var i = 0;
    var numEmails = bundle.MessageCount;
    while (i < numEmails) {
        // email: Email
        var email = bundle.GetEmail(i);

        console.log(email.GetHeaderField("Date"));
        console.log(email.Subject);
        console.log(email.From);
        console.log("--");

        i = i+1;
    }

    // Disconnect from the IMAP server.
    success = imap.Disconnect();


}

chilkatExample();