Output a Field When Present

DataWeave 2.1 is compatible with Mule 4.1. Standard Support for Mule 4.1 ended on November 2, 2020, and this version of Mule will reach its End of Life on November 2, 2022, when Extended Support ends.

Deployments of new applications to CloudHub that use this version of Mule are no longer allowed. Only in-place updates to applications are permitted.

MuleSoft recommends that you upgrade to the latest version of Mule 4 that is in Standard Support so that your applications run with the latest fixes and security enhancements.

This DataWeave example outputs a field if it is present in the input, a JSON array. The first object in the array contains "insurance", while the second does not. The XML output mirrors this structure.

The example uses these functions:

  • map to go through every element within the input array.

  • if($.insurance?) to determine when to output an insurance field.

DataWeave
%dw 2.0
output application/xml
---
users: { (payload map
        user: {
          name: $.name,
          (insurance: $.insurance) if($.insurance?)
        } )
}
Input JSON
[
  {
    "name" : "Julian",
    "gender" : "Male",
    "age" : 41,
    "insurance": "Osde"
  },
  {
    "name" : "Mariano",
    "gender" : "Male",
    "age" : 33
  }
]
Output XML
<?xml version='1.0' encoding='US-ASCII'?>
<users>
  <user>
    <name>Julian</name>
    <insurance>Osde</insurance>
  </user>
  <user>
    <name>Mariano</name>
  </user>
</users>

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