View Assertion Value in SoapUI

Since I dont have the exact JSON response, using an assumed response as below to show how to assert the value

Json Response :

{
  "widget": {     
              "debug": "on",     
              "window": {         
                          "title": "Sample Konfabulator Widget",
                          "name": "main_window",
                          "width": 500,
                          "height": 500     
               },
              "image": {          
                          "src": "Images/Sun.png",         
                          "name": "sun1",
                          "hOffset": 250,
                          "vOffset": 250,
                          "alignment": "center"     
              },
              "text": {         
                          "data": "Click Here",         
                          "size": 36,         
                          "style": "bold",
                          "name": "text1",
                          "hOffset": 250,
                          "vOffset": 100,
                          "alignment": "center",         
                          "onMouseUp": "sun1.opacity = (sun1.opacity / 100) * 90;"
              }
   }
}

Here we are going to check the value of widget -> window -> title

Here is the code block for script assertion for the rest step:

import net.sf.json.groovy.JsonSlurper
def response =new JsonSlurper().parseText(messageExchange.responseContent)
//In your case the path of the required element as mentioned below
def expectedValue = response.widget.window.title
//asserting that response does not have a null
assert null != expectedValue, "Response does not contain value"
//optionally, you can log the value from response
log.info "Value received in the response for the element is : ${expectedValue}"