> For the complete documentation index, see [llms.txt](https://docs.trustlesswork.com/trustless-work/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.trustlesswork.com/trustless-work/v2-en/escrow-js-sdk/errors.md).

# Errors

RFC 9457 Problem Details — TrustlessWorkApiError, TrustlessWorkNetworkError, and helpers.

HTTP failures from Core are RFC 9457 Problem Details. The fetch transport surfaces them as `TrustlessWorkApiError`. Non-problem HTTP failures throw `TrustlessWorkNetworkError`.

### Core exports

```ts
import {
  toTrustlessWorkError,
  TrustlessWorkApiError,
  TrustlessWorkNetworkError,
  formatApiErrorMessage,
  parseProblemDetails,
  parseProblemDetailsFromResponse,
  isProblemDetails,
  ESCROW_ERROR_CODES,
  isEscrowErrorCode,
} from "@trustless-work/escrow-js";
```

| Helper                                     | Role                                                                           |
| ------------------------------------------ | ------------------------------------------------------------------------------ |
| `toTrustlessWorkError`                     | Normalize thrown values → `TrustlessWorkApiError` when body is Problem Details |
| `TrustlessWorkApiError`                    | Typed error with `code`, `status`, `detail`, `traceId`, `extensions`, …        |
| `TrustlessWorkNetworkError`                | Non-problem HTTP failure (`status` + raw `body`)                               |
| `formatApiErrorMessage`                    | One-liner for logs (`[CODE] detail (trace: …)`)                                |
| `parseProblemDetails`                      | Parse unknown JSON into `ApiProblemDetails`                                    |
| `parseProblemDetailsFromResponse`          | Extract Problem Details from status + body (fetch equivalent of Axios helper)  |
| `isProblemDetails`                         | Type guard                                                                     |
| `ESCROW_ERROR_CODES` / `isEscrowErrorCode` | Known escrow machine codes                                                     |

### Example

```ts
try {
  await client.rest.fundEscrow(payload, "single-release");
} catch (error: unknown) {
  const err = toTrustlessWorkError(error);
  if (err instanceof TrustlessWorkApiError) {
    // err.code, err.status, err.detail, err.traceId, err.extensions
    console.error(formatApiErrorMessage(err));
    if (err.code === ESCROW_ERROR_CODES.ESCROW_NOT_FOUND) {
      // handle missing contract
    }
  }
  if (error instanceof TrustlessWorkNetworkError) {
    console.error(error.status, error.body);
  }
}
```

### `TrustlessWorkApiError` fields

| Accessor                                | Source                       |
| --------------------------------------- | ---------------------------- |
| `status`                                | HTTP status                  |
| `code`                                  | Machine-readable code        |
| `detail` / `message`                    | Human detail                 |
| `traceId`                               | Correlation id               |
| `type` / `title` / `instance`           | Problem Details metadata     |
| `extensions`                            | Optional escrow extensions   |
| `isEscrowError()` / `asEscrowProblem()` | Narrow to known escrow codes |

{% hint style="info" %}
Operate and read methods throw the same error classes. Always catch as `unknown` and normalize with `toTrustlessWorkError`.
{% endhint %}


---

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