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並前往https://help.mulesoft.com/s/question/0D52T00004mXTgESAW/how-to-check-a-value-is-null-or-empty-in-data-weave

how to check a value is null or empty in data weave

you can use when operator, you can test null value or empty value (based on what empty means for you). field: 'notNull' when payload !=null otherwise 'null'.

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