isBlank

isBlank(text: String | Null): Boolean

Returns true if the given string is empty (""), completely composed of whitespaces, or null. Otherwise, the function returns false.

Parameters

Name Description

Name	Description
`text`	An input string to evaluate.

text

An input string to evaluate.

Example

This example indicates whether the given values are blank. It also uses the not and ! operators to check that a value is not blank. The ! operator is supported starting in Dataweave 2.2.0. Use ! only in Mule 4.2 and later versions.

Source

%dw 2.0
output  application/json
var someString = "something"
var nullString = null
---
{
  // checking if the string is blank
  "emptyString" : isBlank(""),
  "stringWithSpaces" : isBlank("      "),
  "textString" : isBlank(someString),
  "somePayloadValue" : isBlank(payload.nonExistingValue),
  "nullString" : isBlank(nullString),

  // checking if the string is not blank
  "notEmptyTextString" : not isBlank(" 1234"),
  "notEmptyTextStringTwo" : ! isBlank("")
}DataWeave

Output

{
  "emptyString": true,
  "stringWithSpaces": true,
  "textString": false,
  "somePayloadValue": true,
  "nullString": true,
  "notEmptyTextString": true,
  "notEmptyTextStringTwo": false
}JSON