@loopback/docs
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Documentation for LoopBack 4
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Markdown
lang: en
title: 'API docs: core.application.(constructor)'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.core.application.(constructor).html
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[Home](./index.md) > [@loopback/core](./core.md) > [Application](./core.application.md) > [(constructor)](./core.application.(constructor).md)
## Application.(constructor)
Constructs a new instance of the `Application` class
<b>Signature:</b>
```typescript
constructor(options?: ApplicationConfig);
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| options | <code>ApplicationConfig</code> | |