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isnull() Function


isnull( value )

Returns true if value is null, false otherwise.

See also: a!defaultValue, length()


Keyword Type Description


Any Type

Value to check for null.



Usage considerations

Empty arrays and parameters

  • Empty arrays return false when passed to the isnull() function.
  • The function will not work without a parameter. It is typically used to test whether a Process Variable contains a null value.


isnull(!userPV) returns true where userPV is a process variable of type User, which is null.

Feature compatibility

The table below lists this function's compatibility with various features in Appian.
Feature Compatibility Note
Portals Compatible
Offline Mobile Compatible
Sync-Time Custom Record Fields Compatible

Can be used to create a custom record field that only evaluates at sync time.

Real-Time Custom Record Fields Incompatible
Process Reports Compatible
Process Events Compatible
Open in Github Built: Fri, Apr 12, 2024 (09:32:34 PM)

isnull() Function