@loopback/docs/site/apidocs/openapi-spec-builder.operationspecbuilder.withparameter.md

Documentation for LoopBack 4

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

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

## OperationSpecBuilder.withParameter() method

Describe one more parameters accepted by the operation. Note that parameters are positional in OpenAPI Spec, therefore the first call of `withParameter` defines the first parameter, the second call defines the second parameter, etc.

<b>Signature:</b>

```typescript
withParameter(...parameterSpecs: ParameterObject[]): this;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  parameterSpecs | <code>ParameterObject[]</code> |  |

<b>Returns:</b>

`this`