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DataWeave 2.2 is compatible and bundled with Mule 4.2. This version of Mule reached its End of Life on May 2, 2023, when Extended Support ended.

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.

isWhitespace(String): Boolean

Checks if the text contains only whitespace.

Introduced in DataWeave 2.2.0. Supported by Mule 4.2 and later.


Name Description


The input string.


This example shows how isWhitespace behaves with different inputs and sizes.


%dw 2.0
import isWhitespace from dw::core::Strings
output application/json
  "a": isWhitespace(null),
  "b": isWhitespace(""),
  "c": isWhitespace("  "),
  "d": isWhitespace("abc"),
  "e": isWhitespace("ab2c"),
  "f": isWhitespace("ab-c")


  "a": false,
  "b": true,
  "c": true,
  "d": false,
  "e": false,
  "f": false

isWhitespace(Null): Boolean

Helper function for isWhitespace so it works with null value.