---
lang: en
title: 'API docs: core.application._constructor__1'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/core
permalink: /doc/en/lb4/apidocs.core.application._constructor__1.html
---

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[Home](./index.md) &gt; [@loopback/core](./core.md) &gt; [Application](./core.application.md) &gt; [(constructor)](./core.application._constructor__1.md)

## Application.(constructor)

Create an application with the given configuration and parent context

**Signature:**

```typescript
constructor(config?: ApplicationConfig, parent?: Context);
```

## Parameters

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

Parameter


</th><th>

Type


</th><th>

Description


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

config


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

[ApplicationConfig](./core.applicationconfig.md)


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

_(Optional)_ Application configuration


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

parent


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

[Context](./context.context.md)


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

_(Optional)_ Parent context


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