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[Home](./index.md) &gt; [firefish-js](./firefish-js.md) &gt; [api](./firefish-js.api.md) &gt; [isAPIError](./firefish-js.api.isapierror.md)

## api.isAPIError() function

**Signature:**

```typescript
export declare function isAPIError(reason: any): reason is APIError;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  reason | any |  |

**Returns:**

reason is [APIError](./firefish-js.api.apierror.md)