Convert the groovy map's key value pair to JSON array elements

Question

How to take in key/value pair values of groovy map and loop into JSON array elements in groovy?.

For example:

Input:

def childmap = ["data1": "123", "data2": "234", "data3": "456"]

def childmap2= ["data4": "123", "data5": "234", "data6": "456","date7":"676"]

def parentmap= ["Key1":"Value1","Key2":"Value2","Key3":childmap,"key4":childmap2]

Expected JSON Output:

{
 "Json":{
   "Key1":"Value1",
   "Key2":"Value2"
   "key3":[
      {
         "Name": "data1",
         "ID": "123"
      },
      {
         "Name": "data2",
         "ID": "234"
      },
      {
          "Name": "data3",
          "ID": "456"
      }
   ],
  "key4":[
      {
         "Name": "data4",
         "ID": "123"
      },
      {
         "Name": "data5",
         "ID": "123"
      },
      {
         "Name": "data6",
         "ID": "234"
      },
      {
          "Name": "data7",
          "ID": "456"
      }
   ]
}

}

Possible duplicate of [How to convert hashmap to json object in java](http://stackoverflow.com/questions/12155800/how-to-convert-hashmap-to-json-object-in-java) — Vinay Prajapati, Dec 09 '15 at 07:44
A Map gets converted to JSON map and not JSON array.To do this first convert map to list of map with key-value pairs as needed in question. Then call new JSONObject(list); — Vinay Prajapati, Dec 09 '15 at 07:46
new JSONObject(map); converts all the elements into map. but i need key and value to be stored in the array elements. — Gagan changappa, Dec 09 '15 at 10:18

Emanuel Seidinger · Accepted Answer · 2015-12-09T11:14:16.967

2

This works for your example. This won't work if you've got deeper nesting.

def newmap = parentmap.collectEntries { key, value ->
    [key, (value instanceof Map) ? value.collect {key2, value2 -> [Name: key2, ID: value2]} : value]}


def builder = new JsonBuilder([Json : newmap])
println builder.toPrettyString()

edited Dec 09 '15 at 11:14

answered Dec 09 '15 at 10:40

Emanuel Seidinger

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It seems I've got a reading problem today. Now the code produces the output from your example... I promise :) – Emanuel Seidinger Dec 09 '15 at 11:15
1

Well.. What if i wanna have to work it for deeper nesting,, Is there any code change for it – Gagan changappa Dec 09 '15 at 11:54

Convert the groovy map's key value pair to JSON array elements

1 Answers1