JSONPAth and Conditional statements WITH JavaScript

In a previous thread I asked how to handle JSON and conditional
statemetns without JavaScript.  In this thread I would like
to ask how to use conditional statements WITH JavaScript

I have been reading this site:

    http://goessner.net/articles/JsonPath/

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and using this tester:

    http://jsonpath.curiousconcept.com/

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On the tester I use the following JSON Data

    { "identification" : "AAA" }

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But I can not find an expression that will return a boolean
for what I am writing in PSEUDO CODE below

    $.identification = 'AAA'

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I have 1 question

How would I perform this within JavaScript

Thanks