@loopback/docs/site/apidocs/rest.normalizeparsingerror.md

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---
lang: en
title: 'API docs: rest.normalizeparsingerror'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
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[Home](./index.md) &gt; [@loopback/rest](./rest.md) &gt; [normalizeParsingError](./rest.normalizeparsingerror.md)

## normalizeParsingError() function

Normalize parsing errors as `4xx`

**Signature:**

```typescript
export declare function normalizeParsingError(err: HttpError): HttpError<number>;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

err


</td><td markdown="1">

HttpError


</td><td markdown="1">


</td></tr>
</tbody></table>

**Returns:**

HttpError&lt;number&gt;