---
lang: en
title: 'API docs: core.coretags.extension_for'
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.coretags.extension_for.html
---

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[Home](./index.md) &gt; [@loopback/core](./core.md) &gt; [CoreTags](./core.coretags.md) &gt; [EXTENSION\_FOR](./core.coretags.extension_for.md)

## CoreTags.EXTENSION\_FOR variable

Binding tag for extensions to specify name of the extension point that an extension contributes to.

<b>Signature:</b>

```typescript
EXTENSION_FOR = "extensionFor"
```

