Encapsulate fields - Data Collection| Alibaba Cloud Documentation Center

You can encapsulate one or more fields into a JSON-formatted field by using the processor_packjson plug-in. This topic describes the parameters of the processor_packjson plug-in. This topic also provides examples to show how to configure the plug-in.

Parameters

The following table describes the parameters that you can specify in the detail parameter when you set the type parameter to processor_packjson.

Note Only Logtail V0.16.28 or later supports the plug-in.


Parameter	Type	Required	Description
SourceKeys	String array	Yes	The string array-formatted field to be encapsulated.
DestKey	String	No	The destination JSON-formatted field.
KeepSource	Boolean	No	Specifies whether to retain the source field. Default value: true. This value indicates that the source field is retained.
AlarmIfIncomplete	Boolean	No	Specifies whether to trigger an alert if the source field is not found. Default value: true. This value indicates that an alert is triggered if the source field is not found.

Configuration example

The following example shows how to encapsulate the a and b fields into the d_key field.

Raw log entry
```
"a":"1"
"b":"2"
```

Logtail configurations for data processing

{
  "processors":[
    {
      "type":"processor_packjson",
      "detail": {
        "SourceKeys": ["a","b"],
        "DestKey":"d_key",
        "KeepSource":true,
        "AlarmIfEmpty":true
      }
    }
  ]
}

Result

"a":"1"
"b":"2"
"d_key":"{\"a\":\"1\",\"b\":\"2\"}"