Node.JS zip file interpreter

This projects intends to create/read PKZIP file format.

Install

npm install kyriosli/node-zip

Usage

    var zip = require('node-zip');
    var zipFile = zip.create();
    // or
    var zipFile = zip.unzip('test.zip');

    zipFile.add('index.html', new Buffer('<p>Hello world</p>'));
    zipFile.zip().then(function(buffer) {
        fs.writeFile('test.zip', buffer);
    });

    // The following code shows how to response to a http request with content inside a zip file:
    var zipEntry = zipFile['index.html'];
    if(/\bdeflate\b/.test(req.headers['accept-encoding'])) {
        // write compressed content to browser
        res.setHeader('Content-Encoding', 'deflate');
        zipEntry.pipe(res);
    } else {
        res.setHeader('Content-Length', zipEntry.originalSize);
        zipEntry.toReadStream().pipe(res);
    }

API Reference

Module Methods

exports.create

function create(optional object entries)

Creates a new ZipFile.

entries can be a map of file name and buffer that would be added to the zipFile created.

exports.unzip

function unzip(string|number|Buffer file)

Creates a ZipFile from existing file. file can be a file path, or fd, or a buffer.

class ZipFile

Represents a PKZIP file

Methods

ZipFile.add

function add(string name, Buffer content, optional object options)

Adds a zip file entry

ZipFile[name]

Gets a zip file entry by its name. File Entry name is of UNIX file name format, with no heading slash, for example: README.md or test/index.js

ZipFile.entries

function entries()

Returns a file entry iterator, which yields [name, entry]

ZipFile[Symbol.iterator]

function iterator()

Returns a file entry iterator, which yields entry

ZipFile.zip

function zip()

Returns a Promise, which resolves a buffer when all file entries are compressed and joined together.

class ZipEntry

Represents an entry of a PKZIP file

Fields

ZipEntry.name

The file name of this zip file entry. Note that non-ascii file names is treated as UTF-8 encoded

ZipEntry.originalSize

The uncompressed size of the zipped file, in bytes.

ZipEntry.isDir

Whether a zip entry is directory.

ZipEntry.crc32

The crc32 checksum of the original content.

Methods

ZipEntry.inflate

function inflate()

Returns a Promise that resolves a buffer when file entry content is read and inflated.

ZipEntry.toReadStream

function toReadStream()

Returns a stream.Readable that contains the inflated content.

ZipEntry.pipe

function pipe(Writable writable)

Writes the compressed content to a writable object.

• If the ZipFile that contains this entry is created from original content, the content will be compressed.
• Otherwise, the original compressed content will be written

Note that even compressed = false is given when adding a file entry, the file entry content is still compressed, with options: level = 0 which means no compression is performed, but zlib header and trailer will be appended.