@loopback/docs/site/apidocs/openapi-v3.oasenhancerservice.md

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---
lang: en
title: 'API docs: openapi-v3.oasenhancerservice'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/openapi-v3
permalink: /doc/en/lb4/apidocs.openapi-v3.oasenhancerservice.html
---

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[Home](./index.md) &gt; [@loopback/openapi-v3](./openapi-v3.md) &gt; [OASEnhancerService](./openapi-v3.oasenhancerservice.md)

## OASEnhancerService class

An extension point for OpenAPI Spec enhancement This service is used for enhancing an OpenAPI spec by loading and applying one or more registered enhancers.

A typical use of it would be generating the OpenAPI spec for the endpoints on a server in the `@loopback/rest` module.

<b>Signature:</b>

```typescript
export declare class OASEnhancerService 
```

## Constructors

|  Constructor | Modifiers | Description |
|  --- | --- | --- |
|  [(constructor)(getEnhancers, options)](./openapi-v3.oasenhancerservice._constructor_.md) |  | Constructs a new instance of the <code>OASEnhancerService</code> class |

## Properties

|  Property | Modifiers | Type | Description |
|  --- | --- | --- | --- |
|  [options?](./openapi-v3.oasenhancerservice.options.md) |  | [OASEnhancerServiceOptions](./openapi-v3.oasenhancerserviceoptions.md) \| undefined | <i>(Optional)</i> An extension point should be able to receive its options via dependency injection. |
|  [spec](./openapi-v3.oasenhancerservice.spec.md) |  | [OpenApiSpec](./openapi-v3.openapispec.md) | Getter for <code>_spec</code> |

## Methods

|  Method | Modifiers | Description |
|  --- | --- | --- |
|  [applyAllEnhancers(options)](./openapi-v3.oasenhancerservice.applyallenhancers.md) |  | Generate OpenAPI spec by applying ALL registered enhancers TBD: load enhancers by group names |
|  [applyEnhancerByName(name)](./openapi-v3.oasenhancerservice.applyenhancerbyname.md) |  | Apply a given enhancer's merge function. Return the latest \_spec. |
|  [getEnhancerByName(name)](./openapi-v3.oasenhancerservice.getenhancerbyname.md) |  | Find an enhancer by its name |