Empty Operators

Empty operators check whether a value is present or absent.

Is Empty

Checks if a value is empty, null, or missing:

__notes__ of **Order** is empty

Interactive Example

Reset

Policy Rule

A **Order** needs review if __notes__ of **Order** is empty.

Test Data (JSON)

{ "Order": { "notes": "" } }

▶ Run

Is Not Empty

Checks if a value is present and non-empty:

__email__ of **User** is not empty

Interactive Example

Reset

Policy Rule

A **User** has contact info if __email__ of **User** is not empty and __phone__ of **User** is not empty.

Test Data (JSON)

{ "User": { "email": "alice@example.com", "phone": "+1234567890" } }

▶ Run

What Counts as Empty

Value	is empty	is not empty
"" (empty string)	true	false
null	true	false
missing key	true	false
"hello"	false	true
0	false	true
false	false	true

Common Pattern: Required Fields

Use is not empty to enforce required fields:

Interactive Example

Reset

Policy Rule

A **Registration** is complete if __name__ of **Registration** is not empty and __email__ of **Registration** is not empty and __password__ of **Registration** is not empty.

Test Data (JSON)

{ "Registration": { "name": "Alice", "email": "alice@example.com", "password": "secure123" } }

▶ Run