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XML to JSON
2009-01-21 23:14:07 by Martynas Jusevičius
Lately I got involved with some AJAX, namely dynamic maps and autocompletion. It is much more easier to use JSON as the serialization format than XML because no complex parsing is needed, JSON structures automagically become JavaScript objects. So I knew I need my webservice endpoints to return JSON, but the DIY Framework is based on XML serialization of objects.
Luckily, that was no problem at all, since JSON and XML are basically different syntaxes for the same data model, and I knew XML to JSON conversion could be done using an XSLT stylesheet. And of course I found several existing ones:
- json-xslt by Holten Norris / Alan Lewis (used to be hosted at eBay, but the link redirects somewhere else now). XSLT 1.0, not very clean though, all code crammed into one template.
- XSLTJSON by Bram Stein. Seems pretty advanced, supports different JSON syntax conventions, requires XSLT 2.0 however.
- xml2json-xslt by Doeke Zanstra. XSLT 1.0, pretty neat code, uses its own syntax convention. Has several issues: doesn't support XML attributes and arrays of heterogeneous elements.
I wanted support for XSLT 1.0 and XML attributes and arrays, but none of them really did the job. So I decided to fix the issues of xml2json-xslt by adding attribute and array support, and here is the result:
I'm not really sure if it follows any syntax convention, but it does the job for me. Attributes are serialized in the same fashion as elements, this can be switched off using include-attrs parameter (on by default). Children elements with the same name are grouped using Muenchian method and put into arrays.
I've only tested it on relatively simple and flat XML, so bug reports are welcome :)
Digg this!
del.icio.us!Comments (31)
I worked on a similar implementation back in December as know one had done a pure XSL implementation at the time. Finally getting around to blogging it and I find that you posted one up in late January. My version will provide for different styles of JSON, such as BadgerFish, and perhaps when I have completed the post you can have a look. You are doing some things I had not thought of and vice versa.
Cheers
Keith Chadwick
Article JSON
thanks for more detail easier to use JSON as the serialization format
XML to JSON
You are a great programmer.
I will often come to learn a lot from you.
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Thanks
great info! i'd love to read more articles. thanks
2009-06-23 19:41:02 by Jörn Heid
Great. I just put some <xsl:text> around those {,},[,] and , so that the resulting JSON is a little bit smaller.
2009-08-17 17:22:36 by kamal
hi,
I tried your code but it doesn't work with my XML file wich is the bellow:
<feed xmlns="http://www.w3.org/2005/Atom">
<subtitle>
Un titre secondaire.
</subtitle>
<link href="">
<updated>
2009-12-13T18:30:02Z
</updated>
<author>
<name>
Digiposte
</name>
<email>
xx@xx.fr
</email>
</author>
<id>
urn:uuid:60a76c80-d399-11d9-b91C-0003939e0af6
</id>
<entry>
<category>Facture</category>
<id>documentsecurise/1/3234</id>
<author>
<name>EDF</name>
<uri></uri>
</author>
<link rel="self" href="documentsecurise/1/3234" type="application/pdf">
<published>2009-08-10T09:19:25.188Z</published>
<updated>2009-08-10T09:19:25.188Z</updated>
<summary></summary>
<content type="xhtml">
<div class="infosEmetteur">
<span class="valid">2010-05-18T24:00:00.205Z</span>
<span class="due">2009-06-14T10:07:20.205Z</span>
<span class="idFlux">EDF456</span>
<span class="relation">FAC2783</span>
<span class="referenceEmetteur">FAC4356</span>
<span class="importance">2</span>
<ul class="themes">
<li>energie</li>
<li>facture</li>
<li>electricite</li>
</ul>
<span class="montant">12.55</span>
<span class="devise">EUR</span>
<span class="paye">2</span>
</div>
<div class="gestionDigiposte">
<span class="urlVignette">http://www.xxx.com/documents/FORF2_vignette.png</span>
<span class="tagSystem">1.classeur.factures.appartement.edf</span>
<span class="statut">read</span>
<span class="alerte">V</span>
</div><div class="infosAbonne">
<ul class="tagsAbonne">
<li>facture</li>
<li>maison</li>
<li>edf</li>
</ul>
</div>
<div class="checksum">86f7e437faa5a7fce15d1ddcb9eaeaea377667b8</div>
</content>
</entry>
</feed>
2009-08-17 17:24:13 by kamal
it would be great if you povide me some help regards kamal
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Doesn't handle this
2009-09-13 19:32:14 by Al Pacifico
With the following xml doc:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<tree fruit="pear">partridge</tree>
the output is:
{"tree":{"fruit":"pear","partridge"}
which is not valid JSON.
How should this be handled?
Thanks.
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2009-11-25 17:20:01 by Alan
I just wanted to second Al Pacifico's concerns, I am also having this problem:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<tree fruit="pear">partridge</tree>
the output is:
{"tree":{"fruit":"pear","partridge"}
which is not valid JSON.
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2010-05-20 23:48:56 by Claudius Teodorescu
Hi,
Your xml2json is very nice and useful. I had only to add "{" before the result, in order to evaluate it to an object in JS.
Thank you
Margb
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great info! i'd love to read more articles. thanks
More Improvements
To anybody who stumbles across this. I've modified the file further and fixed the problems mentioned above with
<tree fruit="pear">partridge</tree>
producing invalid JSON.
You can find the project here on GitHub: http://github.com/bdoms/xml2json
Patches and bug reports are welcome!
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2009-03-13 15:25:07 by Keith Chadwick