Using Python to extract JSON from a .js file also containing non-JSON declarations?

Question

I have inherited a number of javascript files containing a mixture of JSON objects and other js declarations (functions, variables). I'm writing a python script to move the data contained in the JSON objects into another system.

I'd like to avoid duplicating any sort of parser functionality in what is essentially a throw away script and avoid combing through the files by hand.

Is there a nice (pythonic) solution to filter out the JSON in these files and pass it to json.loads() ?

Why not use some kind of javascript engine, possibly with a python bridge, to access the new objects created (which are just "plain") objects, then output those as json? — Marcin
– Marcin, Commented May 1, 2012 at 9:25

Community · Accepted Answer · 2017-05-23 10:28:02Z

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You can use regular expressions to isolate those JSON objects you are interested in from your available files. Here is a relevant discussion

edited May 23, 2017 at 10:28

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answered May 1, 2012 at 9:23

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James Fair · Accepted Answer · 2012-04-11 14:50:28Z

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If the data just contained json then probably, but if it contains other javascript declarations then it won't be considered well-formed json

answered Apr 11, 2012 at 14:50

James Fair

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2 Comments

John Bear Over a year ago

Right. I'm looking for a nice way filter out only the JSON.

James Fair Over a year ago

@John Carter I never used phython, but I never heard of a way in any language to extract json among other javascript declarations

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