json.isNull

Returns whether a value is Real’s JSON null sentinel, json.null.

Syntax

json.isNull(value: any): boolean

Name	Type	Required	Description
`value`	`any`	Yes	Value to inspect. Only the json.null value returns true; Lua nil and other values return false.

Name	Type	Description
`isNull`	`boolean`	true when the value is the exact json.null sentinel, otherwise false.

Check whether a value is the json.null sentinel instead of Lua nil.

local value = json.decode("null")

if json.isNull(value) then
    print("The value is JSON null")
end

print(json.isNull(nil))

⌘I