Remove Specified XML Attributes

DataWeave 2.2 is compatible and bundled with Mule 4.2. Standard Support for Mule 4.2 ended on May 2, 2021, and this version of Mule will reach its End of Life on May 2, 2023, 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.

You might want to remove specific attributes from within an XML tag that are known to contain sensitive data. The DataWeave example defines a function in the DataWeave header that removes a specific XML attribute from the passed element and its children. Before you begin, note that DataWeave version 2 (%dw 2.0) is for Mule 4 apps. For a Mule 3 app, refer to DataWeave 1.0 (%dw 1.0) examples, within the Mule 3.9 documentation set. For other Mule versions, you can use the Mule Runtime version selector in the table of contents.

This example uses:

  • mapObject to go through each element.

  • @ to refer to the attributes in an XML element.

  • if and else to conditionally only list XML attributes when they are present, and also to only recursively call the function when a child element is an object.

  • is to check if each child is of type Object .

  • - to remove an element from the list of XML attributes.

  • inlineCloseOn="empty" on the output directive, so that the output XML displays self-closing tags when there are no values.

DataWeave
%dw 2.0
output application/xml inlineCloseOn="empty"
var removeAttribute = (element,attrName) ->
  element mapObject (value, key) -> {
    (key) @(
        (
          if (key.@?)
            (key.@ - attrName)
          else {}
        )
    ) :
    if (value is Object)
      removeAttribute(value, attrName)
    else value
  }
---
removeAttribute(payload, "password")
Input
<users>
  <user username="Julian" password="1234"/>
  <user username="Mariano" password="4321"/>
</users>
Output
<?xml version='1.0' encoding='US-ASCII'?>
<users>
  <user username="Julian"/>
  <user username="Mariano"/>
</users>

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