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Editorial Team
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Asked: 2026-05-21T09:44:04+00:00

I was reading the JMeter documentation and came across this info box about If

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I was reading the JMeter documentation and came across this info box about “If Controllers”:

No variables are made available to the script when the condition is interpreted as Javascript. If you need access to such variables, then select “Interpret Condition as Variable Expression?” and use a __javaScript() function call. You can then use the objects “vars”, “log”, “ctx” etc. in the script.

I don’t quite follow this. Does this mean if I want access to a “User Defined Parameter” then I can access it only by writing some JavaScript? The example that follows this box then refers to “${COUNT}”

Could someone clarify the usage of the If Controller, maybe with an example or two?

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1 Answer

  1. Editorial Team

    You can simply use something like

    ${my_variable}=='1'

    Sometimes JMeter documentation can be confusing 🙂

    Edit 27 september 2017:

    The answer here works but has a very bad performance impact when number of threads exceeds 40.

    See below for correct and most performing answer:

    See:

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