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