---
lang: en
title: 'API docs: rest.validationoptions.ajverrortransformer'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/packages/rest
permalink: /doc/en/lb4/apidocs.rest.validationoptions.ajverrortransformer.html
---

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[Home](./index.md) &gt; [@loopback/rest](./rest.md) &gt; [ValidationOptions](./rest.validationoptions.md) &gt; [ajvErrorTransformer](./rest.validationoptions.ajverrortransformer.md)

## ValidationOptions.ajvErrorTransformer property

A function that transform the `ErrorObject`<!-- -->s reported by AJV. This could be used for error messages customization, localization, etc.

<b>Signature:</b>

```typescript
ajvErrorTransformer?: (errors: ajv.ErrorObject[]) => ajv.ErrorObject[];
```