---
lang: en
title: 'API docs: express.createmiddleware'
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.createmiddleware.html
---

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[Home](./index.md) &gt; [@loopback/express](./express.md) &gt; [createMiddleware](./express.createmiddleware.md)

## createMiddleware() function

An adapter function to create a LoopBack middleware from Express middleware factory function and configuration object.

<b>Signature:</b>

```typescript
export declare function createMiddleware<CFG>(middlewareFactory: ExpressMiddlewareFactory<CFG>, middlewareConfig?: CFG): Middleware;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  middlewareFactory | [ExpressMiddlewareFactory](./express.expressmiddlewarefactory.md)<!-- -->&lt;CFG&gt; | Express middleware factory function |
|  middlewareConfig | CFG | Express middleware config |

<b>Returns:</b>

[Middleware](./express.middleware.md)

A LoopBack middleware function that wraps the Express middleware