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

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

## operation() function

Expose a Controller method as a REST API operation.

<b>Signature:</b>

```typescript
export declare function operation(verb: string, path: string, spec?: OperationObject): MethodDecorator;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  verb | string | HTTP verb, e.g. <code>GET</code> or <code>POST</code>. |
|  path | string | The URL path of this operation, e.g. <code>/product/{id}</code> |
|  spec | OperationObject | The OpenAPI specification describing parameters and responses of this operation. |

<b>Returns:</b>

MethodDecorator