get JSON data value from GET API with TOKEN

[Piyush_Annadate]

I'm trying to fetch an API return; result in JSON FORMAT. Using ScriptRunner JOB - will that be possible to have those results.

URL:  https://slack.com/api/users.lookupByEmail?token=<sometoken>&email=<value that I'll provide>

I would like to have this return value of a particular element. i.e. ID (bold below)

{"ok":true,"user":{"id":"U013MMEPMHC","team_id":"<someother>","name":"piyush.1502","deleted":false,"color":"e7392d","real_name":"piyush.live","tz":"Asia\/Kolkata","tz_label":"India Standard Time","tz_offset":19800}}

 I may need the whole sort of line code to figure this out. 

Type: JIRA SERVER

ScriptRunner - Yes

With Below: Able to fetch the data - but how to only extract the required field and save it in a variable.

import groovyx.net.http.HTTPBuilder
import static groovyx.net.http.ContentType.*
import groovy.json.JsonSlurper
import net.sf.json.groovy.JsonSlurper
import groovyx.net.http.HTTPBuilder
import groovyx.net.http.ContentType
import static groovyx.net.http.Method.*


def http = new HTTPBuilder('https://slack.com/api/users.lookupByEmail?token=xxxxxxxxxxxxxxx&email=piyush.1502@live.com')
http.request(GET) { requestContentType = ContentType.JSON
response.success = { resp, JSON -> return JSON 
}
response.failure = { resp ->
return "Request failed with status ${resp.status}" 
}
}

[Peter-Dave Sheehan · Accepted solution]

I've edited your question to remove the token from your code block... you probably want to keep that private.

But the response.success is already parsing the JSON for you into a nice object structure.

You could just add .user.id after the last curly brace, but something like this will be safer:

def responseObj

def http = new HTTPBuilder('https://slack.com/api/users.lookupByEmail?token=xxxxxxxxxxxxxxx&email=piyush.1502@live.com')
http.request(GET) { 
   requestContentType = ContentType.JSON
   response.success = { resp, JSON -> 
        responseObj = JSON 
   }
   response.failure = { resp ->
      responseObj= [error: "Request failed with status ${resp.status}"] 
   }
}
if(!responseObj?.error){
   userId = responseObj.user.id
}

[Piyush_Annadate]

Thanks @Peter-Dave Sheehan . For the token and the answer. 

I updated it as 

responseObj = JSON.user ? JSON.user.id : null