# is_rule_active · FT4 Rell API · Chromia Docs (concept)

> function is_ rule_ active(rule: rule_expression ): boolean Checks whether the rule expression is active. Can only be called in an operation. Parameters rul

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.accounts/is_rule_active/

FUNCTION

# is\_rule\_active

```signature
function is_rule_active(rule: rule_expression): boolean
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/accounts/auth_descriptor_rule_validation.rell#lines-252)

Checks whether the rule expression is active.

Can only be called in an operation.

**Parameters**

* **rule** — the rule expression to check

**See Also**

* [rule\_expression](https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.accounts/rule_expression/) — for a definition of validity.

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-rell/-f-t4%20-library/lib.ft4.core.accounts/is_rule_active.html)Generated API reference, mirrored from the live docs