[Home](./index.md) > [@firebase/performance](./performance.md) > [PerformanceTrace](./performance.performancetrace.md) > [getAttribute](./performance.performancetrace.getattribute.md) ## PerformanceTrace.getAttribute() method Retrieves the value which a custom attribute is set to. Signature: ```typescript getAttribute(attr: string): string | undefined; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | attr | string | Name of the custom attribute. | Returns: string \| undefined