---
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/loopbackio/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.

**Signature:**

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

## Parameters

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

Parameter


</th><th>

Type


</th><th>

Description


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

verb


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

string


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

HTTP verb, e.g. `GET` or `POST`<!-- -->.


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

path


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

string


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

The URL path of this operation, e.g. `/product/{id}`


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

spec


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

OperationObject


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

_(Optional)_ The OpenAPI specification describing parameters and responses of this operation.


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

**Returns:**

MethodDecorator