===============
Header to field
===============

The following example takes the value from the `applicationId` header and appends it as a new field to the value of the message.



.. code-block:: json
    :caption: Configuration

    {
      "transforms" : "headerToField",
      "transforms.headerToField.type" : "com.github.jcustenborder.kafka.connect.transform.common.HeaderToField$Value",
      "transforms.headerToField.header.mappings" : "applicationId:STRING"
    }

.. code-block:: json
    :caption: Input
    

    {
      "topic" : "testing",
      "kafkaPartition" : 1,
      "valueSchema" : {
        "type" : "STRUCT",
        "isOptional" : false,
        "fieldSchemas" : {
          "firstName" : {
            "type" : "STRING",
            "isOptional" : true
          },
          "lastName" : {
            "type" : "STRING",
            "isOptional" : true
          }
        }
      },
      "value" : {
        "schema" : {
          "type" : "STRUCT",
          "isOptional" : false,
          "fieldSchemas" : {
            "firstName" : {
              "type" : "STRING",
              "isOptional" : true
            },
            "lastName" : {
              "type" : "STRING",
              "isOptional" : true
            }
          }
        },
        "fieldValues" : [ {
          "name" : "firstName",
          "schema" : {
            "type" : "STRING",
            "isOptional" : true
          },
          "storage" : "example"
        }, {
          "name" : "lastName",
          "schema" : {
            "type" : "STRING",
            "isOptional" : true
          },
          "storage" : "user"
        } ]
      },
      "timestamp" : 123412351,
      "timestampType" : "NO_TIMESTAMP_TYPE",
      "offset" : 12345,
      "headers" : [ {
        "name" : "applicationId",
        "schema" : {
          "type" : "STRING",
          "isOptional" : false
        },
        "storage" : "testing"
      } ]
    }

Change(s) in the output are emphasized if delta(s) are detected.

.. code-block:: json
    :caption: Output
    :emphasize-lines: 15, 16, 17, 18, 34, 35, 36, 37, 55, 56, 57, 58, 59, 60, 61

    {
      "topic" : "testing",
      "kafkaPartition" : 1,
      "valueSchema" : {
        "type" : "STRUCT",
        "isOptional" : false,
        "fieldSchemas" : {
          "firstName" : {
            "type" : "STRING",
            "isOptional" : true
          },
          "lastName" : {
            "type" : "STRING",
            "isOptional" : true
          },
          "applicationId" : {
            "type" : "STRING",
            "isOptional" : true
          }
        }
      },
      "value" : {
        "schema" : {
          "type" : "STRUCT",
          "isOptional" : false,
          "fieldSchemas" : {
            "firstName" : {
              "type" : "STRING",
              "isOptional" : true
            },
            "lastName" : {
              "type" : "STRING",
              "isOptional" : true
            },
            "applicationId" : {
              "type" : "STRING",
              "isOptional" : true
            }
          }
        },
        "fieldValues" : [ {
          "name" : "firstName",
          "schema" : {
            "type" : "STRING",
            "isOptional" : true
          },
          "storage" : "example"
        }, {
          "name" : "lastName",
          "schema" : {
            "type" : "STRING",
            "isOptional" : true
          },
          "storage" : "user"
        }, {
          "name" : "applicationId",
          "schema" : {
            "type" : "STRING",
            "isOptional" : true
          },
          "storage" : "testing"
        } ]
      },
      "timestamp" : 123412351,
      "timestampType" : "NO_TIMESTAMP_TYPE",
      "offset" : 12345,
      "headers" : [ {
        "name" : "applicationId",
        "schema" : {
          "type" : "STRING",
          "isOptional" : false
        },
        "storage" : "testing"
      } ]
    }