---
lang: en
title: 'API docs: rest.validationoptions.ajvfactory'
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.ajvfactory.html
---

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

## ValidationOptions.ajvFactory property

A factory to create Ajv instance

<b>Signature:</b>

```typescript
ajvFactory?: (options: ajv.Options) => Ajv;
```