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

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

## deprecated() function

Marks an api path as deprecated. When applied to a class, this decorator marks all paths as deprecated.

You can optionally mark all controllers in a class as deprecated, but use `@deprecated(false)` on a specific method to ensure it is not marked as deprecated in the specification.

<b>Signature:</b>

```typescript
export declare function deprecated(isDeprecated?: boolean): (target: any, method?: string | undefined, methodDescriptor?: TypedPropertyDescriptor<any> | undefined) => any;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  isDeprecated | <code>boolean</code> | whether or not the path should be marked as deprecated. This is useful for marking a class as deprecated, but a method as not deprecated. |

<b>Returns:</b>

`(target: any, method?: string | undefined, methodDescriptor?: TypedPropertyDescriptor<any> | undefined) => any`

## Example


```ts
@oas.deprecated()
class MyController {
  @get('/greet')
  public async function greet() {
    return 'Hello, World!'
  }

  @get('/greet-v2')
  @oas.deprecated(false)
  public async function greetV2() {
    return 'Hello, World!'
  }
}

class MyOtherController {
  @get('/echo')
  public async function echo() {
    return 'Echo!'
  }
}

```


