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

<!-- Do not edit this file. It is automatically generated by API Documenter. -->

[Home](./index.md) &gt; [@loopback/openapi-spec-builder](./openapi-spec-builder.md) &gt; [anOperationSpec](./openapi-spec-builder.anoperationspec.md)

## anOperationSpec() function

Create a new instance of OperationSpecBuilder.

**Signature:**

```typescript
export declare function anOperationSpec(): OperationSpecBuilder;
```
**Returns:**

[OperationSpecBuilder](./openapi-spec-builder.operationspecbuilder.md)