I'm using JMeter 3.1 to run a http-endpoint test & I need to extract a very small portion of the return JSON I receive.

I'm using the JSON Extractor postprocessor element & JSONPath expressions to find my value. This post does a really good job of explaining how to assign the value I'm looking for to a runtime variable.

However it stops short of explaining how to save said variable to an output file. I can check to make sure that I've pulled the data using an assertion rule; I can even save the true/false value of that check. Saving the variable itself however, seems less straightforward.

I have 3 ideas and am likely going to spend the next few hours exploring them & checking this thread. So,

Will any of these work?:

  • Figure out what "Sub Results" means to JMeter and see if I can get my JSON snippet there.
  • Make another sampler that (somehow) just reads & returns a variable I pass it at runtime, whenever a thread executes.
  • Figure out if "Assertion Results" is capable of saving anything other than "TRUE" or "FALSE."

Here's an image!

  • Can you give an example of data you receive and what exactly you need to save and how that is going to be used?
    – Rao
    Commented Mar 27, 2017 at 7:00
  • I'm running a "server-blind" test (aka I do not want the aid of my server-side metrics) against my web-API to see if I can determine server-side delivery-speed from a client. There's a 0.04Kb dictionary from the 1Kb JSON response which I want in a csv field. I posted this to stackoverflow and got an answer re: putting vars into a csv. If you don't think it's a comprehensive answer, I'll hold-off posting it here. Here's the link: stackoverflow.com/questions/43035806/…
    – Rob Truxal
    Commented Mar 27, 2017 at 20:37

1 Answer 1


As it has never been added, the answer has been given here: https://stackoverflow.com/questions/43035806/how-do-i-save-jmeter-variables-created-at-runtime-specifically-a-snippet-of-js/43037917#43037917

And see manual on Sample variable

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