---
lang: en
title: 'API docs: openapi-spec-builder.operationspecbuilder.withparameter'
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.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.

**Signature:**

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

## Parameters

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

Parameter


</th><th>

Type


</th><th>

Description


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

parameterSpecs


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

ParameterObject\[\]


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


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

**Returns:**

this