Properties

Properties access values from objects in your data. They are wrapped in double underscores: __name__.

Basic Properties

A property reads a field from a selector’s object:

__age__           →  object.age
__email__         →  object.email
__first_name__    →  object.first_name

Linking Properties to Selectors

Use of to specify which object a property belongs to:

__age__ of **Person**
__email__ of **User**

The word the can be added for readability — it’s ignored by the parser:

the __age__ of the **Person**

Interactive Example

Reset

Policy Rule

A **Person** is verified if the __name__ of the **Person** is not empty and the __email__ of the **Person** is a valid email.

Test Data (JSON)

{ "Person": { "name": "Alice", "email": "alice@example.com" } }

▶ Run

Nested Property Access

For nested JSON structures, you can chain properties using of:

the __city__ of the __address__ of the **Person**

or you can nest the selector

the __city__ of the **address** of the **Person**

This reads data.Person.address.city.

Interactive Example

Reset

Policy Rule

A **Person** is local if the __city__ of the __address__ of the **Person** is equal to "London".

Test Data (JSON)

{ "Person": { "address": { "city": "London", "country": "UK" } } }

▶ Run

Properties with Spaces

Property names can contain spaces:

__date of birth__
__first name__
__postal code__

These map to camelCase or snake_case JSON keys automatically. The engine handles case conversion between naming conventions.

Property Names and JSON Keys

The engine automatically converts between naming conventions:

Property	Matches JSON key
__first_name__	first_name or firstName
__date of birth__	date of birth, dateOfBirth, date_of_birth
__postCode__	postCode or post_code