---
lang: en
title: 'API docs: testlab.expresscontextstub.app'
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.expresscontextstub.app.html
---

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[Home](./index.md) &gt; [@loopback/testlab](./testlab.md) &gt; [ExpressContextStub](./testlab.expresscontextstub.md) &gt; [app](./testlab.expresscontextstub.app.md)

## ExpressContextStub.app property

**Signature:**

```typescript
app: express.Application;
```