JSZip Memory Issue

JSZip Memory Issue

By : Pedro Côrte-Real
Date : November 17 2020, 01:00 AM
I think the issue was by ths following , If you use the same JSZip instance to load each and every file, you will keep everything in memory : the load method doesn't replace the existing content.
Try using a new JSZip instance each time :
code :
var zipObj = new JSZip();
// or var zipObj = new JSZip(data);

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xhr Post with JSZip Javascript / JSZip upgrade

xhr Post with JSZip Javascript / JSZip upgrade

By : Rasmus
Date : March 29 2020, 07:55 AM
it helps some times I'm trying to 'post' and xhr request using a zip file but I'm having trouble getting the zip in the right format. I found a post that showed a similar request using this: , why don't you try this way
code :
zip.generateAsync({type:"blob"}).then(function(content) {
  var data = new FormData();
  data.append("files", content, "Test.zip");
I need JSZip and gzip for my web page, and JSZip has all the ingredients, but hides them in ways I can't crack

I need JSZip and gzip for my web page, and JSZip has all the ingredients, but hides them in ways I can't crack

By : GeRmAn
Date : March 29 2020, 07:55 AM
seems to work fine As Evert was saying, I should have checked first for the build instructions in the documentation https://stuk.github.io/jszip/documentation/contributing.html.
From that it is clear, first one needs git and makes a local clone. Then one needs to set up the grunt command line, which requires, npm, which comes with nodejs. Once grunt runs, there are other dependencies that need to be npm install-ed. It's the usual little things off and not working, but enough Googling and brute force retrying to get it done.
code :
JSZip.external = require("./external");
module.exports = JSZip;
JSZip.flate = require("./flate");
JSZip.DataWorker = require('./stream/DataWorker');
JSZip.DataLengthProbe = require('./stream/DataLengthProbe');
JSZip.Crc32Probe = require('./stream/Crc32Probe');
JSZip.StreamHelper = require('./stream/StreamHelper');
JSZip.pako = require("pako");
(new JSZip.StreamHelper(
   (new JSZip.DataWorker(Promise.resolve("Hello World! Hello World! Hello World! Hello World! Hello World! Hello World!")))
      .pipe(new JSZip.DataLengthProbe("uncompressedSize"))
      .pipe(new JSZip.Crc32Probe())
      .pipe(new JSZip.DataLengthProbe("compressedSize"))
      .on("end", function(event) { console.log("onEnd: ", this.streamInfo) }), 
   "uint8array", "")
).accumulate(function(data) { console.log("acc: ", data); })
 .then(function(data) { console.log("then: ", data); })
'use strict';

var external = require('../external');
var utils = require('../utils');
var flate = require('../flate');
var GenericWorker = require('../stream/GenericWorker');
var DataWorker = require('../stream/DataWorker');
var StreamHelper = require('../stream/StreamHelper');
var DataLengthProbe = require('../stream/DataLengthProbe');
var Crc32Probe = require('../stream/Crc32Probe');

function GZipFileWorker() {
    GenericWorker.call(this, "GZipFileWorker");
    this.virgin = true;
utils.inherits(GZipFileWorker, GenericWorker);

GZipFileWorker.prototype.processChunk = function(chunk) {
    if(this.virgin) {
        this.virgin = false;
        var headerBuffer = new ArrayBuffer(10);
        var headerView = new DataView(headerBuffer);
        headerView.setUint16(0, 0x8b1f, true); // GZip magic
        headerView.setUint8(2, 0x08); // compression algorithm DEFLATE
        headerView.setUint8(3, 0x00); // flags
        // bit 0   FTEXT
        // bit 1   FHCRC
        // bit 2   FEXTRA
        // bit 3   FNAME
        // bit 4   FCOMMENT
        headerView.setUint32(4, (new Date()).getTime()/1000>>>0, true);
        headerView.setUint8(8, 0x00); // no extension headers
        headerView.setUint8(9, 0x03); // OS type UNIX
        this.push({data: new Uint8Array(headerBuffer)});

GZipFileWorker.prototype.flush = function() {
    var trailerBuffer = new ArrayBuffer(8);
    var trailerView = new DataView(trailerBuffer);
    trailerView.setUint32(0, this.streamInfo["crc32"]>>>0, true);
    trailerView.setUint32(4, this.streamInfo["originalSize"]>>>0 & 0xffffffff, true);
    this.push({data: new Uint8Array(trailerBuffer)});

exports.gzip = function(data, inputFormat, outputFormat, compressionOptions, onUpdate) {
    var mimeType = data.contentType || data.mimeType || "";
    if(! (data instanceof GenericWorker)) {
        inputFormat = (inputFormat || "").toLowerCase();
        data = new DataWorker(
            utils.prepareContent(data.name || "gzip source",
                                 inputFormat !== "string",
                                 inputFormat === "binarystring",
                                 inputFormat === "base64"));
    return new StreamHelper(
            .pipe(new DataLengthProbe("originalSize"))
            .pipe(new Crc32Probe())
            .pipe(flate.compressWorker( compressionOptions || {} ))
            .pipe(new GZipFileWorker()),
        outputFormat.toLowerCase(), mimeType).accumulate(onUpdate);
var gzip = require("./generate/GZipFileWorker");
JSZip.gzip = gzip.gzip;
JSZip.gzip("Hello World! Hello World! Hello World! Hello World! Hello World! Hello World!", "string", "base64", {level: 3}).then(function(result) { console.log(result); })
$ echo -n "H4sIAOyR/VsAA/NIzcnJVwjPL8pJUVTwoJADAPCORolNAAAA" |base64 -d |zcat
Hello World! Hello World! Hello World! Hello World! Hello World! Hello World!
JSZip.gzip(file, "", "Blob").then(function(blob) { 
     xhr.setRequestProperty("Content-encoding", "gzip");
Module not found: Error: Can't resolve 'stream' in 'C:\dev\jszip-test\node_modules\jszip\lib'

Module not found: Error: Can't resolve 'stream' in 'C:\dev\jszip-test\node_modules\jszip\lib'

By : Ramesh Shilvant
Date : March 29 2020, 07:55 AM
This might help you After reading this post I found out that the stream package was missing from my project.
You can install it by running the following command:
code :
npm i stream
issue with JSZip 3.0

issue with JSZip 3.0

By : user3545159
Date : March 29 2020, 07:55 AM
I hope this helps you . I have an error with JSZip 3.0. I am making a code for creating and download zip for that I am using the JSZip library. , Try this code
code :
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jszip/3.2.1/jszip.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jszip-utils/0.1.0/jszip-utils.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/1.3.8/FileSaver.min.js"></script>
<script type="text/javascript">
var zip = new JSZip();
var urls = ["logo.png","foot-logo.png"];
var count = 0;
var zipFilename = "zipFilename.zip";
  var filename = "filename";
  JSZipUtils.getBinaryContent(url, function (err, data) {

     if(err) {
        throw err; // or handle the error
     zip.file(url, data, {binary:true});
     if (count == urls.length) {
.then(function (blob) {
    saveAs(blob, zipFilename);
Javascript zip file
How to include jszip with requirejs : jszip is not defined

How to include jszip with requirejs : jszip is not defined

By : Pilar Rey del Castil
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , JSZip (and ODS to support ods extension) must be loaded and attached to the window before XLSX is loaded. I'm getting it working using shim with a custom "xlsx-loader":
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