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.

capitalize(String): String

Capitalizes the first letter of each word in a string.

It also removes underscores between words and puts a space before each capitalized word.


Name Description


The string to capitalize.


This example capitalizes a set of strings.


%dw 2.0
import * from dw::core::Strings
output application/json
  "a" : capitalize("customer"),
  "b" : capitalize("customer_first_name"),
  "c" : capitalize("customer NAME"),
  "d" : capitalize("customerName")


  "a": "Customer",
  "b": "Customer First Name",
  "c": "Customer Name",
  "d": "Customer Name"

capitalize(Null): Null

Helper function that allows capitalize to work with null values.

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