Verify JSON Data
Gene Heskett
gheskett at shentel.net
Mon May 26 11:37:10 EDT 2014
On Monday 26 May 2014 11:19:53 Roy Smith did opine
And Gene did reply:
> In article <e26d3f14-ac97-4abd-bdfc-699d9ed2175c at googlegroups.com>,
>
> gaurangnshah at gmail.com wrote:
> > Hi Guys,
> >
> > Would someone let me know how to verify JSON data in python. There
> > are so many modules available to verify XML file, however i didn't
> > find any good module to verify JSON Data.
>
> Python comes with a built-in json module. Just use json.load() or
> json.loads() to parse your JSON data. The first call reads from a
> string, the second on from a file, but in all other ways, they're
> identical.
>
> There are a bunch of third-party modules (ujson, etc) which are faster,
> but fundamentally, they're all the same.
>
> If I understand you correctly, you're reading a JSON document which is
> so large that if you store the converted data as a Python object, you
> run out of memory? If that's the case, I'm not sure if there's a good
> pure Python solution. I don't know of any json modules which parse,
> but don't store, the data.
>
> Depending on what operating system you're on, there may be a
> command-line utility which parse JSON. For example, on Ubuntu linux,
> there's "json_xs". Perhaps shell out to that, use the "-t null" output
> format, redirect the output to /dev/null, and see what exit status you
> get:
>
> # Good JSON
> $ echo '[1, 2, 3]' | json_xs -t null 2>/dev/null; echo $?
> 0
>
> # Bad JSON
> $ echo '[1; 2, 3]' | json_xs -t null 2>/dev/null; echo $?
> 255
>
> Wrap this up in a subprocess.check_output() call, and you're done.
Just for S&G, and without checking the version numbers of anything, this
may not be all that bulletproof a test:
gene at coyote:~$ echo '[1, 2, 3]' | json_xs -t null 2>/dev/null; echo $?
127
gene at coyote:~$ echo '[1; 2, 3]' | json_xs -t null 2>/dev/null; echo $?
127
Old, buntu 10.04.4 LTS system, all up to date security patches wise.
kernal 3.13.9, PAE on a quad core phenom.
Interesting result. Source of error? DamnedifIknow.
Cheers, Gene Heskett
--
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