Where Does Persistent File System Storage Store with Chrome

Where does PERSISTENT file system storage store with chrome?

For me, at least on Mac OSX, they're stored under /Users/USERNAME/Library/Application Support/Google/Chrome/Default/File System for me. If you're using profiles, there will be profile directories instead of Default. However, each origin's saved files/folders are obfuscated under directories that won't be easy for you to interact with.

For debugging the Filesystem API, you have a few options:

1. Use this extension to view/remove files.
2. See the tips here: http://updates.html5rocks.com/2011/08/Debugging-the-Filesystem-API
   That includes viewing stored files very easily using the filesystem: URLs.
3. Drop the Filesystem Playground demo (http://html5-demos.appspot.com/static/filesystem/filer.js/demos/index.html) into your origin. You can use that to view/rename/delete files/folders easily.
4. Chrome DevTools now has support for the Filesystem API for viewing the files stored under an origin. To use that, you will need to enable the Developer Tools experiments in about:flags, restart, hit the gear in the devtools (lower right corner), and enable the 'FileSystem inspection' under the experimental tab.

Chrome App Persistent Filesystem Storage not reliable

Increasing the amount of bytes allocated to the app worked.
I was storing more than i was allocating.

window.requestFileSystem  = window.requestFileSystem || window.webkitRequestFileSystem;
window.requestFileSystem(
    window.PERSISTENT, 200*1024*1024,    <====
    function(filesystem) {
        directory.fs = filesystem;
        //Start Application
    },
    filesystemerrorHandler
);

Where is the filesystem in html5 stored on the real file system?

originally I think all file is stored on a virtual file system , so files can be protected. but it's not. for chrome, file is placed at "C:\Users\user name\AppData\Local\Google\Chrome\User Data\Default\File System" with obfuscated name on windows 7. so you can operate on it as local file.

Persistent local storage for both Firefox and Chrome?

I agree with the other comments about caching and the Chrome/Firefox marketplaces, and they may ultimately be better solutions for you. However, to answer your original question...

IndexedDB in Chrome is definitely not limited to 5 MB. You can store far more than 50 MB in IndexedDB in both Firefox and Chrome, assuming the user has enough hard drive space. Higher amounts of IndexedDB storage are regularly reached in this game I wrote. On my computer, I currently have over 500 MB stored in IndexedDB in Chrome for that one domain.

You did correctly link to https://developers.google.com/chrome/whitepapers/storage and it is quite confusing, but as I understand it, basically the upper limit is 10% of the free space on the hard drive. Another caveat described on that page is that IndexedDB is technically "temporary" storage that the browser might delete if space is running low, but in practice this seems to rarely happen (YMMV).

Where is the file sandbox for a Chrome app?

They go into a "sandbox" which isn't easy to inspect. You might want to instead use the new chrome.fileSystem chooseEntry function (http://developer.chrome.com/apps/fileSystem.html) with the "directory" option and also "retainEntry" to get access to write to a normal directory on your computer, so that you can see the files and have them not be cleared out when you clear your browser cache, etc.

How is HTML5 WebStorage data physically stored?

Chrome uses SQLite for LocalStorage.

I confirmed this by going to AppData\Local\Google\Chrome\User Data\Default\Local Storage on my local PC and viewing the contents of a file. The files start with "SQLite format 3" when viewed via a text editor. You will need a SQLite database viewer to view the data.

Storage for chrome-extension

What about the chrome.storage API? https://developer.chrome.com/extensions/storage

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