var EasyFtp = require('easy-ftp');
var ftp = new EasyFTP();
var config = {
    host: '',
    port: 21,
    username: '',
    password: ''
};

ftp.connect(config);

 var filesFrom=['/file1.txt','/anotherFile.txt','/moreFiles.txt','/a.txt','/x.txt']
 var filesTo=['/archived/file1.txt','/archived/anotherFile.txt','/archived/moreFiles.txt','/archived/a.txt','/archived/x.txt']

 for (var i = 0; i < filesFrom.length; i++) {
    ftp.mv(filesFrom[i], filesTo[i], function(err, newPath){
        if (err) { console.log(err) }
    });
 };

ftp.close();

function mvFiles(ftpObj, fromArray, toArray, callback) {
    let index = 0;
    let results = [];

    function next() {
        if (index < fromArray.length) {
            let i = index++;
            ftpObj.mv(fromArray[i], toArray[i], function(err, newPath) {
                if (err) {
                    callback(err);
                } else {
                    results[i] = newPath;
                    next();
                }
            });
        } else {
            callback(null, results);
        }
    }
    next();
}

ftp.connect(config);

var filesFrom =['/file1.txt','/anotherFile.txt','/moreFiles.txt','/a.txt','/x.txt'];
var filesTo =['/archived/file1.txt','/archived/anotherFile.txt','/archived/moreFiles.txt','/archived/a.txt','/archived/x.txt'];

mvFiles(ftp, filesFrom, filesTo, function(err, newPaths) {
    ftp.close();
    if (err) {
        // process error here
    } else {
        // all done here
    }
});