Groovy returning JSON - json

Question

I have the following Groovy script (not a Grails app) that is returning a JSON-like, but it is not strictly valid JSON.
String baseURL = 'https://test.com'
File userFile = new File("./user.json")
def client = new HTTPBuilder(baseUrl)
client.headers['Content-Type'] = 'application/json'
client.request(GET, JSON) { req ->
requestContentType = JSON
headers.Accept = 'application/json'
response.success = { resp, json ->
userFile.append json.toString()
println JsonOutput.toJson(json.toString())
}
}
I am trying to create a JSON output file. I have tried using JsonOutput.prettyPrint and I looked at JsonBuilder, but that looks like I would have to build the JSON structure manually when Groovy should support the output. This is what I am getting back.
{AssetNumber=AssetNumber1, DeviceFriendlyName=FriendlyName1, PhoneNumber=17035551231, SerialNumber=SerialNumber1, Udid=Udid1, UserEmailAddress=user1#email.com, UserId=userId1, UserName=userName1}
As I said, this is JSON-like, but not strictly valid. I was expecting something like:
{"AssetNumber": "AssetNumber1", "DeviceFriendlyName": "FriendlyName1"....}
Any ideas?

Answer 1

It works perfectly fine (groovy v 2.3.6):
import groovy.json.*
def pretty = JsonOutput.prettyPrint(JsonOutput.toJson([1:2]))
assert pretty == """{
"1": 2
}"""
In this closure:
response.success = { resp, json ->
userFile.append json.toString()
println JsonOutput.toJson(json.toString())
}
You're getting an instance of Map under json variable. You do not need to turn it into a string. Instead use:
userFile.append JsonOutput.toJson(json)
println JsonOutput.toJson(json)