rest - How to find property name exists in soap ui response thats in Json -

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i trying figure out how find if particular property name exists in json response using soap ui. ex:

{"day_details":  [{ "duration": "p0y0m0dt9h17m", "activities":    [         {      "crew_base": "nyp",      "to_location": "nyp",      "start_datetime": "2016-04-26t12:52:00-04:00",      "end_datetime": "2016-04-26t16:30:00-04:00",   },     }

from above code need find if "activities", crew_base property name exists. not concern data or value has. appreciated.


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