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---
lang: en
title: 'API docs: express.expressmiddlewareinterceptorprovider._constructor_'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/express
permalink: /doc/en/lb4/apidocs.express.expressmiddlewareinterceptorprovider._constructor_.html
---
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
[Home](./index.md) > [@loopback/express](./express.md) > [ExpressMiddlewareInterceptorProvider](./express.expressmiddlewareinterceptorprovider.md) > [(constructor)](./express.expressmiddlewareinterceptorprovider._constructor_.md)
## ExpressMiddlewareInterceptorProvider.(constructor)
Constructs a new instance of the `ExpressMiddlewareInterceptorProvider` class
<b>Signature:</b>
```typescript
constructor(middlewareFactory: ExpressMiddlewareFactory<CFG>, middlewareConfig?: CFG | ContextView<CFG>);
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| middlewareFactory | [ExpressMiddlewareFactory](./express.expressmiddlewarefactory.md)<!-- --><CFG> | |
| middlewareConfig | CFG \| [ContextView](./context.contextview.md)<!-- --><CFG> | |