---
lang: en
title: 'API docs: core.extensions.list'
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.extensions.list.html
---

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[Home](./index.md) &gt; [@loopback/core](./core.md) &gt; [extensions](./core.extensions.md) &gt; [list](./core.extensions.list.md)

## extensions.list() function

Inject an array of resolved extension instances for the extension point. The list is a snapshot of registered extensions when the injection is fulfilled. Extensions added or removed afterward won't impact the list.

**Signature:**

```typescript
function list(extensionPointName?: string, metadata?: InjectionMetadata): (target: Object, member: string | undefined, methodDescriptorOrParameterIndex?: number | TypedPropertyDescriptor<any> | undefined) => void;
```

## Parameters

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

Parameter


</th><th>

Type


</th><th>

Description


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

extensionPointName


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

string


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

_(Optional)_ Name of the extension point. If not supplied, we use the `name` tag from the extension point binding or the class name of the extension point class. If a class needs to inject extensions from multiple extension points, use different `extensionPointName` for different types of extensions.


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

metadata


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

[InjectionMetadata](./context.injectionmetadata.md)


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

_(Optional)_ Optional injection metadata


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

**Returns:**

(target: Object, member: string \| undefined, methodDescriptorOrParameterIndex?: number \| TypedPropertyDescriptor&lt;any&gt; \| undefined) =&gt; void

## Example


```ts
import {extensionPoint, extensions} from '@loopback/core';

@extensionPoint(GREETER_EXTENSION_POINT_NAME)
export class GreetingService {
 constructor(
   @extensions.list() // Inject an array of extensions for the extension point
   private greeters: Greeter[],
   // ...
) {
  // ...
}
```