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json.decode

Decodes a specific field from JSON raw data (string) to structured data.

Description​

The processor takes JSON raw data (string or []byte) from the target field, parses it as JSON structured data and stores the decoded structured data in the target field.

This processor is only applicable to fields under .Key, .Payload.Before and .Payload.After, as they can contain structured data.

Configuration parameters​

NameTypeDefaultDescription
fieldstring
null

Field is a reference to the target field. Only fields that are under .Key and .Payload can be decoded.

For more information about the format, see Referencing fields.

Examples​

Decode record key as JSON​

This example takes a record containing a raw JSON string in .Key and converts it into structured data.

Configuration parameters​

NameValue
field.Key

Record difference​

Before
After
1
{
1
{
2
  "position": null,
2
  "position": null,
3
  "operation": "create",
3
  "operation": "create",
4
  "metadata": null,
4
  "metadata": null,
5
-
  "key": "{\"after\":{\"data\":4,\"id\":3}}",
5
+
  "key": {
6
+
    "after": {
7
+
      "data": 4,
8
+
      "id": 3
9
+
    }
10
+
  },
6
  "payload": {
11
  "payload": {
7
    "before": null,
12
    "before": null,
8
    "after": null
13
    "after": null
9
  }
14
  }
10
}
15
}




Decode nested field as JSON​


This example takes a record containing a raw JSON string in
.Payload.Before.foo and converts it into a map.


Configuration parameters​


NameValue
field.Payload.Before.foo


Record difference​


Before
After
1
{
1
{
2
  "position": null,
2
  "position": null,
3
  "operation": "snapshot",
3
  "operation": "snapshot",
4
  "metadata": null,
4
  "metadata": null,
5
  "key": null,
5
  "key": null,
6
  "payload": {
6
  "payload": {
7
    "before": {
7
    "before": {
8
-
      "foo": "{\"before\":{\"data\":4,\"id\":3},\"baz\":\"bar\"}"
8
+
      "foo": {
9
+
        "baz": "bar",
10
+
        "before": {
11
+
          "data": 4,
12
+
          "id": 3
13
+
        }
14
+
      }
9
    },
15
    },
10
    "after": null
16
    "after": null
11
  }
17
  }
12
}
18
}