quodolores/docs-exp/performance.performancetrace.getmetric.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; [getMetric](./performance.performancetrace.getmetric.md)

## PerformanceTrace.getMetric() method

Returns the value of the custom metric by that name. If a custom metric with that name does not exist will return zero.

<b>Signature:</b>

```typescript
getMetric(metricName: string): number;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  metricName | string | Name of the custom metric. |

<b>Returns:</b>

number