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

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[Home](./index.md) &gt; [@loopback/testlab](./testlab.md) &gt; [createRestAppClient](./testlab.createrestappclient.md)

## createRestAppClient() function

Create a SuperTest client for a running RestApplication instance. It is the responsibility of the caller to ensure that the app is running and to stop the application after all tests are done.

**Signature:**

```typescript
export declare function createRestAppClient(app: RestApplicationLike): supertest.SuperTest<supertest.Test>;
```

## Parameters

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

Parameter


</th><th>

Type


</th><th>

Description


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

app


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

[RestApplicationLike](./testlab.restapplicationlike.md)


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

A running (listening) instance of a RestApplication.


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

**Returns:**

supertest.SuperTest&lt;supertest.Test&gt;