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title: 'API docs: boot.controllerbooter._constructor_'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
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[Home](./index.md) > [@loopback/boot](./boot.md) > [ControllerBooter](./boot.controllerbooter.md) > [(constructor)](./boot.controllerbooter._constructor_.md)
## ControllerBooter.(constructor)
Constructs a new instance of the `ControllerBooter` class
<b>Signature:</b>
```typescript
constructor(app: Application, projectRoot: string, controllerConfig?: ArtifactOptions);
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| app | [Application](./core.application.md) | |
| projectRoot | string | |
| controllerConfig | [ArtifactOptions](./boot.artifactoptions.md) | |