(Node.js) Delete Local Files that Do Not Exist on the FTP Server

Demonstrates how to get a list of local files in a directory tree that do not exist on the FTP server.

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 ftp = new chilkat.Ftp2();

    ftp.Hostname = "ftp.example.com";
    ftp.Username = "login";
    ftp.Password = "password";

    ftp.KeepSessionLog = true;

    // Connect and login to the FTP server.
    var success = ftp.Connect();
    if (success !== true) {
        console.log(ftp.LastErrorText);
        return;
    }

    // Set the current remote directory to the root of
    // the remote tree to be compared.
    success = ftp.ChangeRemoteDir("abc123");
    if (success !== true) {
        console.log(ftp.LastErrorText);
        return;
    }

    // Recursively descend the local directory tree
    // and find the files that exist locally but not remotely.
    // These are the files what would be uploaded via
    // the SyncRemoteTree method call with mode = 1.
    // (Mode 1 would upload all files that do not exist on the FTP server.)

    // The actual uploading is avoided by setting the preview-only argument to true.
    var mode = 1;
    var descendTree = true;
    var previewOnly = true;
    success = ftp.SyncRemoteTree2("/temp/abc123",mode,descendTree,previewOnly);
    if (success !== true) {
        console.log(ftp.LastErrorText);
        return;
    }

    // The files what would've been uploaded are now available in the SyncPreview property,
    // which contains a list of local file paths, one per line.
    // A program can iterate over them like this:
    var sa = new chilkat.StringArray();
    sa.LoadFromText(ftp.SyncPreview);

    var fac = new chilkat.FileAccess();

    var numFiles = sa.Count;
    var i = 0;
    var localFilePath;
    while ((i < numFiles)) {
        localFilePath = sa.GetString(i);
        console.log(localFilePath);

        // An application can delete the file using Chilkat's file access object,
        // or it can choose to use the native file API available in the programming language:
        success = fac.FileDelete(localFilePath);
        if (success !== true) {
            console.log("Failed to delete: " + localFilePath);
        }

        i = i+1;
    }

    success = ftp.Disconnect();

}

chilkatExample();