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

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[Home](./index.md) &gt; [@loopback/express](./express.md) &gt; [MiddlewareBindingOptions](./express.middlewarebindingoptions.md) &gt; [chain](./express.middlewarebindingoptions.chain.md)

## MiddlewareBindingOptions.chain property

Name of the middleware extension point. Default to `DEFAULT_MIDDLEWARE_CHAIN`<!-- -->.

<b>Signature:</b>

```typescript
chain?: string;
```

