使用adm-zip从JSON对象创建zip文件

Question

I'm trying to create a .zip file from a JSON object in Node.js. I'm using adm-zip to do that however I'm unable to make it work with this code:

var admZip = require('adm-zip');
var zip = new admZip();
zip.addFile(Date.now() + '.json', new Buffer(JSON.stringify(jsonObject));
var willSendthis = zip.toBuffer();
fs.writeFileSync('./example.zip', willSendthis);

This code creates example.zip but I'm not able to extract it, I tried with a .zip extractor but also with this code:

var admZip = require('adm-zip');
var zip = new admZip("./example.zip");
var zipEntries = zip.getEntries(); // an array of ZipEntry records

zipEntries.forEach(function(zipEntry) {
    console.log(zipEntry.data.toString('utf8')); 
});

It returns Cannot read property 'toString' of undefined at the line with console.log .

I could use zip.writeZip() for this example but I'm sending the .zip file to Amazon S3 thus I need to use the method .toBuffer() to do something like this after using adm-zip :

var params = {Key: 'example.zip', Body: zip.toBuffer()};
s3bucket.upload(params, function(err, data) {...});

I don't see what is wrong, am I using the package correctly?

Answer 1

Try use zipEntry.getData().toString('utf8') instead zipEntry.data.toString('utf8') :

var admZip = require('adm-zip');
var zip = new admZip("./example.zip");
var zipEntries = zip.getEntries(); // an array of ZipEntry records

zipEntries.forEach(function(zipEntry) {
    console.log(zipEntry.getData().toString('utf8')); 
});