---
lang: en
title: 'API docs: core.extensionfor'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/packages/core
permalink: /doc/en/lb4/apidocs.core.extensionfor.html
---

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[Home](./index.md) &gt; [@loopback/core](./core.md) &gt; [extensionFor](./core.extensionfor.md)

## extensionFor() function

A factory function to create binding template for extensions of the given extension point

<b>Signature:</b>

```typescript
export declare function extensionFor(...extensionPointNames: string[]): BindingTemplate;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  extensionPointNames | string\[\] | Names of the extension point |

<b>Returns:</b>

[BindingTemplate](./context.bindingtemplate.md)