isempty()

Returns true if the argument is an empty string or is null.

isempty("") == true

Syntax

isempty([value])

Returns

Indicates whether the argument is an empty string or isnull.

x	isempty(x)
""	true
"x"	false
parsejson("")	true
parsejson("[]")	false
parsejson("{}")	false

Example

T
| where isempty(fieldName)
| count