> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-5b6e02fd.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# UnauthorizedResponseError - TypeScript SDK

> UnauthorizedResponseError type definition

<Warning>
  The TypeScript SDK and docs are currently in beta.
  Report issues on [GitHub](https://github.com/OpenRouterTeam/typescript-sdk/issues).
</Warning>

Unauthorized - Authentication required or invalid credentials

## Example Usage

```typescript lines theme={null}
import { UnauthorizedResponseError } from "@openrouter/sdk/models/errors";

// No examples available for this model
```

## Fields

| Field                | Type                                                                                                               | Required             | Description                         | Example                                                    |
| -------------------- | ------------------------------------------------------------------------------------------------------------------ | -------------------- | ----------------------------------- | ---------------------------------------------------------- |
| `error`              | [models.UnauthorizedResponseErrorData](/client-sdks/typescript/api-reference/models/unauthorizedresponseerrordata) | :heavy\_check\_mark: | Error data for UnauthorizedResponse | `{"code": 401,"message": "Missing Authentication header"}` |
| `openrouterMetadata` | `Record<string, *any*>`                                                                                            | :heavy\_minus\_sign: | N/A                                 |                                                            |
| `userId`             | *string*                                                                                                           | :heavy\_minus\_sign: | N/A                                 |                                                            |