voluptasmollitia/docs-exp/performance.performancetrace.putattribute.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/performance](./performance.md) &gt; [PerformanceTrace](./performance.performancetrace.md) &gt; [putAttribute](./performance.performancetrace.putattribute.md)

## PerformanceTrace.putAttribute() method

Set a custom attribute of a trace to a certain value.

<b>Signature:</b>

```typescript
putAttribute(attr: string, value: string): void;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  attr | string | Name of the custom attribute. |
|  value | string | Value of the custom attribute. |

<b>Returns:</b>

void