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How to verify JSON Data in Python?

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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.

After searching on the internet I came across JSON module, however it only coverts the JSON data to python. it's good, however the problem comes when JSON response is very large.

Is there any module through which I can verify JSON file like DOM or Object oriented way. ( i.e. data.key)

posted May 26, 2014 by Amit Parthsarthi

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1 Answer

+1 vote

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.

answer May 26, 2014 by anonymous
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