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---
title: "Frequently Asked Questions"
layout: default
section: main
---
### "Corrupted zip or bug: unexpected signature"
If you are sure that the zip file is correct, that error often comes from a
corrupted content. An ajax request, if not prepared correctly, will try to
decode the binary content as a text and corrupt it. See
[this page]({{site.baseurl}}/documentation/howto/read_zip.html).
### My browser crashes / becomes unresponsive / never finish the execution
That happens if you try to handle to much data with the synchronous API. If
possible, try the asynchronous API, see
[this page]({{site.baseurl}}/documentation/limitations.html) for more information.
### Can't read the data of [...]. Is it in a supported JavaScript type ?
Or the old message:
> The data of [...] is in an unsupported format
The method [`file(name, data [,options])`]({{site.baseurl}}/documentation/api_jszip/file_data.html)
accepts string and binary inputs for `data`.
If you use an unsupported type, an object for example, you will get this error:
```js
// WRONG
var data = {
content: new ArrayBuffer(...)
};
zip.file("my.data", data); // won't work, data is an object
// CORRECT
var data = new ArrayBuffer(...);
zip.file("my.data", data); // will work, JSZip accepts ArrayBuffer
```
### My mac generates a `.cpgz` file when I try to extract the zip file
MacOS Finder has a lot of bug related to zip files (the `unzip` command line
tool is fine). When something goes wrong, Finder will generate this cpgz file
instead of showing an error.
To get a correct result, try to enable compression in `generateAsync`:
```js
zip.generateAsync({
type:"...",
compression: "DEFLATE" // <-- here
});
```
Using `platform: "UNIX"` may help too.
|
