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

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

## ValidationOptions interface

Options for request body validation using AJV

**Signature:**

```typescript
export interface ValidationOptions extends AjvOptions 
```
**Extends:** AjvOptions

## Properties

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

Property


</th><th>

Modifiers


</th><th>

Type


</th><th>

Description


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

[ajvErrors?](./rest.validationoptions.ajverrors.md)


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


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

[AjvErrorOptions](./rest.ajverroroptions.md)


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

_(Optional)_ Enable custom error messages in JSON-Schema for AJV validator from https://github.com/epoberezkin/ajv-errors - `true`<!-- -->: Enable `ajv-errors` - `AjvErrorOptions`<!-- -->: Enable `ajv-errors` with options


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

[ajvErrorTransformer?](./rest.validationoptions.ajverrortransformer.md)


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


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

(errors: ErrorObject\[\]) =&gt; ErrorObject\[\]


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

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


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

[ajvFactory?](./rest.validationoptions.ajvfactory.md)


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


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

(options: AjvOptions) =&gt; Ajv


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

_(Optional)_ A factory to create Ajv instance


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

[ajvKeywords?](./rest.validationoptions.ajvkeywords.md)


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


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

string\[\]


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

_(Optional)_ Enable additional AJV keywords from https://github.com/epoberezkin/ajv-keywords - `string[]`<!-- -->: Add an array of keywords from `ajv-keywords`


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

[compiledSchemaCache?](./rest.validationoptions.compiledschemacache.md)


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


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

[SchemaValidatorCache](./rest.schemavalidatorcache.md)


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

_(Optional)_ Custom cache for compiled schemas by AJV. This setting makes it possible to skip the default cache.


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

[prohibitedKeys?](./rest.validationoptions.prohibitedkeys.md)


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


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

string\[\]


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

_(Optional)_ An array of keys to be rejected, such as `__proto__`<!-- -->.


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