---
lang: en
title: 'API docs: openapi-spec-builder'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.openapi-spec-builder.html
---

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

## openapi-spec-builder package

[@loopback/openapi-spec-builder](https://github.com/strongloop/loopback-next/tree/master/packages/openapi-spec-builder)

## Classes

|  Class | Description |
|  --- | --- |
|  [BuilderBase](./openapi-spec-builder.builderbase.md) |  |
|  [OpenApiSpecBuilder](./openapi-spec-builder.openapispecbuilder.md) | A builder for creating OpenApiSpec documents. |
|  [OperationSpecBuilder](./openapi-spec-builder.operationspecbuilder.md) | A builder for creating OperationObject specifications. |

## Functions

|  Function | Description |
|  --- | --- |
|  [anOpenApiSpec()](./openapi-spec-builder.anopenapispec.md) | Create a new instance of OpenApiSpecBuilder. |
|  [anOperationSpec()](./openapi-spec-builder.anoperationspec.md) | Create a new instance of OperationSpecBuilder. |