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This example will show how to add the key expression if the desired key value does not exist within existing JSON data. Sample Input Value 
{
  "statusCode" : 200,
  "statusDescription" : "OK",
  "numRows" : 1,
  "data" : [ {
    "data" : {
      "Alan1" : "içerik1",
      "Alan2" : "içerik2",
      "Alan3" : 1,
      "Alan4" : "içerik3",
      "Alan5" : "içerik4",
      "NewField": "test"
    }
  } ],
  "elapsedTime" : 1,
  "errors" : [ ]
}
JOLT Transformation Code 
[
	{
		"operation": "modify-default-beta",
		"spec": {
			"data": {
				"*": {
					"data": {
						"NewField": null,
						"NewField2": null
					}
				}
			}
		}
	}
]
Sample Output Value 
{
  "statusCode" : 200,
  "statusDescription" : "OK",
  "numRows" : 1,
  "data" : [ {
    "data" : {
      "Alan1" : "içerik1",
      "Alan2" : "içerik2",
      "Alan3" : 1,
      "Alan4" : "içerik3",
      "Alan5" : "içerik4",
      "NewField" : "test",
      "NewField2" : null
    }
  } ],
  "elapsedTime" : 1,
  "errors" : [ ]
}