---
lang: en
title: 'API docs: openapi-v3.param.where'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/openapi-v3
permalink: /doc/en/lb4/apidocs.openapi-v3.param.where.html
---

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[Home](./index.md) &gt; [@loopback/openapi-v3](./openapi-v3.md) &gt; [param](./openapi-v3.param.md) &gt; [where](./openapi-v3.param.where.md)

## param.where() function

Sugar decorator for `where` query parameter

**Signature:**

```typescript
function where(modelCtor: typeof Model, name?: string): (target: object, member: string, index: number) => void;
```

## Parameters

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

Parameter


</th><th>

Type


</th><th>

Description


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

modelCtor


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

typeof Model


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

Model class


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

name


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

string


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

_(Optional)_ Custom name for the parameter, default to `where`


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

**Returns:**

(target: object, member: string, index: number) =&gt; void

## Example


```ts
async count(
  @param.where(modelCtor)) where?: Where<T>,
): Promise<Count> {
  // ...
}
```