"bad zipfile offset (local header sig)"

node-archiver-append.js

fs.writeFile(jsonFile, json, function (err) {
    if (err) {
        res.send(500, JSON.parse('{"code": 500, "description":"' + err + '"}'));
        return;
    }

    var fileName = pathToFiles + "exercises/B" + req.params.bookId + "L" + req.params.lessonId + ".zip";
    var output = fs.createWriteStream(fileName);
    var archive = archiver('zip');

    archive.on('error', function(err) {
        res.send(500, JSON.parse('{"code": 500, "description":"' + err + '"}'));
        return;
    });

    archive.pipe(output);
    
    for (var k = 0; k < dataToZip.length; k++) {
        console.log("path %s name %s", dataToZip[k].path, dataToZip[k].name);
        archive.append(fs.createReadStream(dataToZip[k].path), { name: dataToZip[k].name });
    }

    archive.finalize(function(err, written) {
        if (err) {
            res.send(500, JSON.parse('{"code": 500, "description":"' + err + '"}'));
            return;
        }

        res.send(200, JSON.parse('{"code": 200, "file":"http://hermes.ezlearn.com.br/files/exercises/B' + req.params.bookId + "L" + req.params.lessonId + '.zip"}'));
    });
});