## badRequest() function

**Signature:**

```typescript
export declare function badRequest(details: string, expression?: string | string[]): OperationOutcome;
```

## Parameters

| Parameter  | Type                       | Description |
|------------|----------------------------|-------------|
| details    | string                     |             |
| expression | string \| string\[\]     | _(Optional)_ |

**Returns:**

OperationOutcome

- [badRequest() function](/content/docs/sdk/core.badrequest#badrequest-function/index.html)
- [Parameters](/content/docs/sdk/core.badrequest#parameters/index.html)