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The data is stored with the browser's buil-in localStorage mechanism, which is exposed as a JavaScript API, as explained in the full article.

The localStorage mechanism does not create a data file in the file system per app. Rather, it is using a browser-specific cache file managed by the browser and not intended to be accessed/inspected by the devloper/user.

So, lets say I need to reformat my drive and re-load MS Win (which I do about every 6mo-1yr). How do I save my valuable data?
Thx
You would need to add an "Export/import data" function to the app, which should not be a big thing.

Notice, however, that the Local Storage technology cannot be used for larger data sets, or for business-critical apps. In these cases, you would rather use the IndexDB API or a remote storage solution like cloud storage or a back-end DBMS. I'll show how to do this (cloud storage with Parse.com and using the back-end DBMS MySQL with NodeJS) in follow-up tutorials.

Thank you for your reply.

Can I some way save data to localhost / php?

Perhaps if I explain my need it will make more sense.

I am an accomplished programmer and use PHP everyday.
I have wanted to use some type of browser program to
write an airplane performance tool. If I use PHP and SQLITE
it limits users that don't know how to set up localhost.
I have a server but the average Joe does not.

I really like JS but every time I look at a potential
application I always hit a snag with data storage issues.
Your article re-ignited my interest in JS but once again
the data storage issue arises.

You should be able to save data by sending HTTP POST (or PUT) messages to a localhost HTTP server via the XHR API. However, you'd have to take care of the Same Origin Policy by enabling CORS HTTP headers (e.g. access-control-allow-origin: *).

Another possibility to save data may be to write the data to another browser window/tab using, and instruct the user to save the contents of this window/tab to a file.

Thank you for this article, it's very informative and easy to read!
I found this article to be nicely written and easy to follow. Thanks
Source: www.codeproject.com
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