Returns a LOGICAL indicating if a property in a JsonObject contains the null value.

Return type: LOGICAL

Access: PUBLIC

Applies to: Progress.Json.ObjectModel.JsonObject class

Syntax

IsNull(INPUT property-name AS CHARACTER )
property-name
A CHARACTER expression naming the property to be tested.

property-name is case-sensitive.

A JsonError is raised if:

  • property-name is the empty string (""), or is the Unknown value (?)
  • The property does not exist