In what form does Chrome save local storage? - google-chrome

I am trying to figure out where and how does Chrome save local storage.
I found the following folder (in my home folder) that seems to contain the local storage:
\AppData\Local\Google\Chrome\User Data\Default\Local Storage
In this folder I see files that corresponds to different URLs (the files contain URLs in their names). For each URL I see two types of files:
LOCALSTORAGE file
LOCALSTORAGE-JOURNAL file
I am interested in local storage of one particular web site. For this web-site the LOCALSTORAGE file contains only 6KB and the LOCALSTORAGE-JOURNAL contains nothing (0 KB).
On the other hand, when I open the web site of interest in Chrome and then press F12 I see in the local storage 6 different URL and if I click on one of them I see key-value pairs.
So, what I see in the folder and in the Chrome development tool is not consistent. Why is that? How can one find content of local storage in the directories? Or is it impossible?

The file is in SQL Lite format. Install SQL Lite, then type the following commands:
cd %LocalAppData%\Google\Chrome\User Data\Default\Local Storage
sqlite3 *filename*
select * from ItemTable;
.quit
The ItemTable table contains key-value pairs, the semantics of which depend on the individual website.

see the description of localstorage file here
it says : The extension LOCALSTORAGE indicates an application support file created by the web browsers using WebKit, such as Google Chrome and Apple Safari. These files store browser settings or local data for a browser extension, and enables extensions to store a local cache of user data saved in an SQLite database format.
You can browse localstorage files by a sql-lite browser, such as the open source program called sql-lite database browser

Related

Form-based File Upload in HTML and remote files

I was reading RFC 1867 about Form-based File Upload in HTML section 5.7 regarding Remote files with third-party transfer but instead of specifications/implementations there is a question and suggestion.
Then I have checked RFC 2854, which obsoletes RFC 1867, but there is nothing regarding remote files.
My question is there any specification on form-based file upload in HTML and remote files? Is this possible to process/attach remote files accessing them via URLs?
What I'm looking for is that instead of "choose file"->select->open file as a file input it want to grab selected remote files (from a modal) via provided URLs to them and send same one as a file input handler. Something like Google Drive allows to attach as a file not a link to it in Gmail platform.
The HTML specifications aren't published as RFCs any more.
The current specification is HTML 5.1 2nd Edition.
It defines file inputs, but the user interface (including where files can be selected from) is an implementation detail left up to the browser.
I'm not aware of any browser that allows a file to be selected using a URL, but most will support files shared using the operating system's supported network filesystems.
It also defines url inputs which could provide the server with a URL (leaving the actual fetching of the data from that URL up to server side code).

Open binary file from HTML5 offline web application

I'm able to use HTML5 standard File API and IndexedDB to store large binary files in the browser.
However, when offline, I need to be able to open these files. Using data URLs works great for small files, but none of the browsers support 10Mb file opening through data URL. Is there any other solution, except for non-standard window.webkitRequestFileSystem?
I've actually found an answer here: https://developer.mozilla.org/en/docs/Web/API/Blob.
It is possible to save result of FileReader.readAsArrayBuffer in IndexedDB. When offline, it is possible to create a blob from this typed array and then create data URL to be passed to window.open function. Works with large files!

Load local image, modify it and save back to same file

File input allows user to access a local file from browser. Is it possible to load a local file given by file input, modify it and save it back to same local file? I know that HTML5 allows creating writeable filesystem, but basically it seems to be abstract directory.
For security reasons, I don't think the browser can overwrite the local file. Using the File-System API you could only copy the contents of the local file to the sandboxed File-System API directory(found under various obfuscated file names). All manipulation/saving would be done in AppData.
Perhaps displaying the modified image on the screen, right click, save-as to the given file location would also be suitable? (other than that I think you have to upload the image to a server and download it back again)

Temporary file handle storage in HTML5

Is it possible to obtain file handles in HTML5 and store it as a blob in webDB for upload later?
(Upload selected images when the 3G network is available again, without re-selecting the files.)
The HTML5 will be loaded from the local client device and
action="http://.../insert.jsp"
be used to upload the files to the server.
Any help or ideas will be very useful.
C-:
Any File object can be converted to an URL.
It is simple to do by using object URLs as described by:
https://developer.mozilla.org/en-US/docs/Using_files_from_web_applications
(I still have to confirm that the URLs remain valid across sessions.)
And it does not remain valid across sessions in Chrome!

How is HTML5 WebStorage data physically stored?

In using the HTML5 WebStorage functionality, I know that certain browsers, like Chrome, have developer tools that enable users to browse thru the contents of their WebStorage for debugging and trouble-shooting purposes.
I was wondering if it is possible to view the contents of web storage in the file system. Is this content stored in text files on the file system that are in some standard location? Or is this data stored in some proprietary binary format by the various browsers and is not designed to be accessible or viewable by browsing the file system?
My motivation for asking this question is to see if you can view the content of WebStorage on the file system as an aid to development and debugging, and also just out of curiosity too see how this data is actually stored.
Thanks.
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.
On Mac OS X, this was at ~/Library/Application Support/Google/Chrome/Default/Local Storage
I used the Command Line Shell For SQLite to look around. Assuming www.example.com was a real site, you can run these commands:
$ sqlite3 http_www.example.com_0.localstorage
sqlite> .tables
ItemTable
sqlite> .schema
CREATE TABLE ItemTable (key TEXT UNIQUE ON CONFLICT REPLACE, value BLOB NOT NULL ON CONFLICT FAIL);
sqlite> select * from ItemTable;
stringkey|value
jsonkey|{"key","value"}
sqlite> .exit
See Where does firefox store javascript/HTML localStorage? for the Firefox storage location.  Chrome uses individual sqlite files per hostname and protocol, where Firefox uses a single webappsstore.sqlite file with the reversed hostname and protocol in a scope column.
See Where the sessionStorage and localStorage stored? for the Opera storage location. Opera uses an XML index file and individual XML files for the Base64 encoded data.
Just wanted to contribute for IE 11.
The localstorage is stored in: C:\Users[YOUR USER ACCOUNT]\AppData\LocalLow\Microsoft\Internet Explorer\DOMStore
However, it is hidden by default. To show this folder you have to:
Folder Options --> Uncheck "Hide protected operating system file"
Back to folder, you will see some sub folder inside. Go to each folder will see some XML files according for websites.