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

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[Home](./index.md) &gt; [@loopback/repository-json-schema](./repository-json-schema.md) &gt; [isArrayType](./repository-json-schema.isarraytype.md)

## isArrayType() function

Determines whether a given string or constructor is array type or not

**Signature:**

```typescript
export declare function isArrayType(type: string | Function | PropertyType): boolean;
```

## Parameters

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

Parameter


</th><th>

Type


</th><th>

Description


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

type


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

string \| Function \| PropertyType


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

Type as string or wrapper


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

**Returns:**

boolean