Generate and load JSON dump in modern browsers?

Question

I am writting a Web app that can save or open a JSON object, what's the best practice to make it behave exactly like an offline desktop app? Should the JSON dump just be in plain text or something?

Could it function properly even if there is no network connection? This means we have to use pure client side Javascript generate a savefile/openfile dialog box.

excanoe · Accepted Answer · 2011-05-09 09:27:41Z

1

You can use localStorage API of modern browsers to save all your needed data.

localStorage gives you ability to store offline data, but make sure that your data fits within quota.

Also keep in mind that native JSON support can be handy in this case (like JSON.stringify()).

Here are some links that might be useful:

JSON in JS

localStorage

answered May 9, 2011 at 9:27

excanoe

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5 Comments

est Over a year ago

Could I use something other than localStorage? I need the data to be exported and portable.

excanoe Over a year ago

What you mean by "exported and portable"? All data that is stored in json structures are "portable" in scope of json syntax because it's in serialized form, and you can easily get data from localStorage back.

est Over a year ago

because, like the JSON dump needed to be carried to a different machine using a usb key ?

excanoe Over a year ago

If you need to pull out all your data in json you can use JSON.stringify(). All that data is simple (utf8 or unicode which is utf16 i think - not sure about this ) text so you can grab it, paste into your file on usb key, and restore it later.

excanoe Over a year ago

You can't access file system, because of security reasons (javascript sandbox). Maybe this will be helpful dev.w3.org/2006/webapi/FileAPI

est · Accepted Answer · 2012-08-08 08:36:06Z

I now have the proper technology to do this:

open dialogs: http://www.html5rocks.com/en/tutorials/file/dndfiles/
save JSON data: something like data://application/json;base64,eyJkYXRhIjogImhlbGxvLCBqc29uISJ9
native json parse https://developer.mozilla.org/en-US/docs/Using_native_JSON

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