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Documentation for LoopBack 4
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lang: en
title: 'API docs: express.middlewarebindingoptions'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/packages/express
permalink: /doc/en/lb4/apidocs.express.middlewarebindingoptions.html
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[Home](./index.md) > [@loopback/express](./express.md) > [MiddlewareBindingOptions](./express.middlewarebindingoptions.md)
## MiddlewareBindingOptions interface
Options to bind middleware as a request context based interceptor within an `InvokeMiddleware` action of the sequence.
<b>Signature:</b>
```typescript
export interface MiddlewareBindingOptions extends BaseMiddlewareBindingOptions<MiddlewareContext>
```
## Properties
| Property | Type | Description |
| --- | --- | --- |
| [chain](./express.middlewarebindingoptions.chain.md) | string | Name of the middleware extension point. Default to <code>DEFAULT_MIDDLEWARE_CHAIN</code>. |