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[Home](./index.md) &gt; [rc-js-util](./rc-js-util.md) &gt; [INestedError](./rc-js-util.inestederror.md) &gt; [causeToString](./rc-js-util.inestederror.causetostring.md)

## INestedError.causeToString() method

Attempt to serialize `causedBy`<!-- -->, where this is not possible, undefined is returned.

**Signature:**

```typescript
causeToString(): string | undefined;
```
**Returns:**

string \| undefined