workflow/docs/api-reference/workflow/fatal-error.mdx

Workflow DevKit - Build durable, resilient, and observable workflows

---
title: FatalError
description: Throw to mark a step as permanently failed without retrying.
type: reference
summary: Throw FatalError in a step to mark it as permanently failed and prevent retries.
prerequisites:
  - /docs/foundations/errors-and-retries
related:
  - /docs/api-reference/workflow/retryable-error
---

When a `FatalError` is thrown in a step, it indicates that the workflow should not retry a step, marking it as failure.

You should use this when you don't want a specific step to retry.

```typescript lineNumbers
import { FatalError } from "workflow"

async function fallibleWorkflow() {
    "use workflow"
    await fallibleStep();
}

async function fallibleStep() {
    "use step"
    throw new FatalError("Fallible!") // [!code highlight]
}
```

## API Signature

### Parameters

<TSDoc
definition={`
interface Error {
  /**

* The error message.
   */
  message: string;
}
export default Error;`}
/>