> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apinizer.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Adding Key Value if Key Value is Not Found

> You can add missing key values within JSON data. This page includes an example of adding new key values using modify-default-beta operation.

This example will show how to **add the key expression** if the desired **key** value does not exist within existing JSON data.

### Input Value

```json theme={null}
{
  "statusCode": 200,
  "statusDescription": "OK",
  "numRows": 1,
  "data": [
    {
      "data": {
        "Alan1": "içerik1",
        "Alan2": "içerik2",
        "Alan3": 1,
        "Alan4": "içerik3",
        "Alan5": "içerik4",
        "NewField": "test"
      }
    }
  ],
  "elapsedTime": 1,
  "errors": []
}
```

### JOLT Specification

```json theme={null}
[
  {
    "operation": "modify-default-beta",
    "spec": {
      "data": {
        "*": {
          "data": {
            "NewField": null,
            "NewField2": null
          }
        }
      }
    }
  }
]
```

### Output Value

```json theme={null}
{
  "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": []
}
```