Change the Value of a Field

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.

This DataWeave example changes the values of some XML elements. Here, it changes the values of keys containing sensitive data to a set of asterisks (****). 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.

The example uses these functions:

  • mapObject to go through the users in the input. When on each user, it uses two other mapObject functions to go through the fields in both personal information and the login information.

  • if and else to mask the values of the ssn and password keys.

DataWeave
%dw 2.0
output application/xml
---
users: { (payload.users mapObject (userObject) -> {
    user: {
         personal_information: userObject.personal_information mapObject (value, key) ->
         {
            (if (key ~= "ssn") (key): "****"  else (key): value)
         },
         login_information: userObject.login_information mapObject (value, key) ->
         {
            (if (key ~= "password") (key): "****" else (key): value)
         }
      }
   })
}
Input XML
<users>
    <user>
        <personal_information>
            <first_name>Emiliano</first_name>
            <middle_name>Romoaldo</middle_name>
            <last_name>Lesende</last_name>
            <ssn>001-08-84382</ssn>
        </personal_information>
        <login_information>
            <username>3miliano</username>
            <password>mypassword1234</password>
        </login_information>
    </user>
    <user>
        <personal_information>
            <first_name>Mariano</first_name>
            <middle_name>Toribio</middle_name>
            <last_name>de Achaval</last_name>
            <ssn>002-05-34738</ssn>
        </personal_information>
        <login_information>
            <username>machaval</username>
            <password>mypassword4321</password>
        </login_information>
    </user>
</users>
Output XML
<?xml version="1.0" encoding="UTF-8"?>
<users>
  <user>
    <personal_information>
      <first_name>Emiliano</first_name>
      <middle_name>Romoaldo</middle_name>
      <last_name>Lesende</last_name>
      <ssn>****</ssn>
    </personal_information>
    <login_information>
      <username>3miliano</username>
      <password>****</password>
    </login_information>
  </user>
  <user>
    <personal_information>
      <first_name>Mariano</first_name>
      <middle_name>Toribio</middle_name>
      <last_name>de Achaval</last_name>
      <ssn>****</ssn>
    </personal_information>
    <login_information>
      <username>machaval</username>
      <password>****</password>
    </login_information>
  </user>
</users>

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