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Documentation for LoopBack 4
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lang: en
title: 'API docs: boot.bootstrapper.(constructor)'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.boot.bootstrapper.(constructor).html
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[Home](./index.md) > [@loopback/boot](./boot.md) > [Bootstrapper](./boot.bootstrapper.md) > [(constructor)](./boot.bootstrapper.(constructor).md)
## Bootstrapper.(constructor)
Constructs a new instance of the `Bootstrapper` class
<b>Signature:</b>
```typescript
constructor(app: Application & Bootable, projectRoot: string, bootOptions?: BootOptions);
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| app | <code>Application & Bootable</code> | |
| projectRoot | <code>string</code> | |
| bootOptions | <code>BootOptions</code> | |