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---
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
---
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
[Home](./index.md) > [@loopback/repository-json-schema](./repository-json-schema.md) > [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