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isBlank(String | Null): Boolean

Returns true if the given string is empty or completely composed of whitespace, false if not.


Name Description


A input string to evaluate.


This example indicates whether the given values are blank. It also uses the not and ! operators to check that a value is not blank.


%dw 2.0
output  application/json
  "empty" : isBlank(""),
  "withSpaces" : isBlank("      "),
  "withText" : isBlank(" 1223"),
  // not blank
  "checkNotEmpty" : not isBlank(" 1234"),
  // ! for not in DataWeave 2.2.0 for Mule 4.2 and later
  "checkNotEmptyTwo" : ! isBlank(" 1234")


  "empty": true,
  "withSpaces": true,
  "withText": false,
  "checkNotEmpty": true,
  "checkNotEmptyTwo": true

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