@loopback/docs/site/apidocs/core.application.component.md

Documentation for LoopBack 4

---
lang: en
title: 'API docs: core.application.component'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.core.application.component.html
---

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

## Application.component() method

Add a component to this application and register extensions such as controllers, providers, and servers from the component.

<b>Signature:</b>

```typescript
component(componentCtor: Constructor<Component>, name?: string): Binding<Component>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  componentCtor | <code>Constructor&lt;Component&gt;</code> | The component class to add. |
|  name | <code>string</code> | Optional component name, default to the class name |

<b>Returns:</b>

`Binding<Component>`

## Example


```ts

export class ProductComponent {
  controllers = [ProductController];
  repositories = [ProductRepo, UserRepo];
  providers = {
    [AUTHENTICATION_STRATEGY]: AuthStrategy,
    [AUTHORIZATION_ROLE]: Role,
  };
};

app.component(ProductComponent);

```