> ## Documentation Index
> Fetch the complete documentation index at: https://docs.endstate.io/llms.txt
> Use this file to discover all available pages before exploring further.

# isValidationError

> True for validation.failed, narrowing `details` to present.

```ts theme={null}
isValidationError(value: unknown): value is EndstateApiError & {
```

## Example

```ts theme={null}
if (isValidationError(error)) showFieldErrors(error.details);
```