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From Lorenzo Fundaró <>
Subject Re: JSON to string in javascript via BSF post processor, etc.? Seem to come across a problem. A bug? Any help or tips?
Date Tue, 25 Nov 2014 10:33:16 GMT
Hello David,

alternatively to handle JSON you could look at some extra tools available

Some of them could ease your life handling json.

Cheers !

Lorenzo Fundaró García

On Tue, Nov 25, 2014 at 10:01 AM, Felix Schumacher <> wrote:

> Hello David,
> Am 25.11.2014 04:57, schrieb David Luu:
>> I was wondering if anyone has dealt with JSON data and the need to
>> stringify it at some point and doing this in JMeter, say with BSF sampler
>> for javascript?
>> Any tips on that would be appreciated.
>> I gave it a try and noticed that JMeter, at least as of version 2.9
>> r1437961 that I'm using, seems to support JSON.stringify(), or using it
>> doesn't cause any errors.
>> However, in one situation, it fails to work. I can't share the full test
>> plan but here's a snippet around the issue:
>> //after HTTP sampler, we process JSON response in BSF post processor in
>> javascript
>> eval('var jsonResponse = ' + prev.getResponseDataAsString());
> if you are using the JSON object (below with stringify) anyway, why not use
>  var jsonResponse = JSON.parse(prev.getResponseDataAsString());
> instead of eval(...)?
>  jsonResponse.cacheOnly = false;
>> jsonResponse.someItemId = vars.get("SOMEITEMID");
>> //...some other stuff dealing with updating JSON object member values
>> vars.put("testVar", jsonResponse.someItemId);
>> vars.put("JSON_OBJ_AS_STR", JSON.stringify(jsonResponse));
>> I'm reusing JSON_OBJ_AS_STR or can be a new JMeter variable.
>> If I set JSON object member someItemId, then the stringify fails (without
>> any complain from JMeter other than test failure at some point). Using
> Have you looked in jmeter.log?
>  debug sampler after this, I notice that JSON_OBJ_AS_STR isn't updated as
>> expected (using old value) or the new variable isn't defined/set, although
>> testVar is defined correctly. If I omit defining new member "someItemId"
>> and setting it's value, then the stringify works fine. But I need both
>> things together.
> You could try to enclose the javascript code in a try/catch block and log
> the possibly catched exceptions.
>  Felix
>> SOMEITEMID is actually a JMeter variable set by a Regular Expression
>> Extractor that is set to match a single match group in parenthesis in the
>> regex.
>> SOMEITEMID =14179242
>> SOMEITEMID_g0=someText someMoreText" id="14179242"
>> SOMEITEMID_g1=14179242
>> I also tried using  SOMEITEMID_g1 instead of base variable, didn't make a
>> difference.
>> Is the problem to do with regular expression matched variable and
>> JSON.stringify used together?
>> I guess I could look for alternate javascript solution, or worst case swap
>> to try doing it in Java like
>> it's just that javascript is simpler to deal with if I can. I don't
>> suppose
>> a newer version of Jmeter fixes this issue...
>> I could look into JSONPath related route, but as I'm dealing with multiple
>> updates to JSON object data, it seems easier to do in code whether
>> javascript, Java, etc.
>> Thanks for reading. Any feedback appreciated,
>> David
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