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---
lang: en
title: 'API docs: express.middlewarecreationoptions'
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.middlewarecreationoptions.html
---
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[Home](./index.md) > [@loopback/express](./express.md) > [MiddlewareCreationOptions](./express.middlewarecreationoptions.md)
## MiddlewareCreationOptions interface
Options for defining a middleware
**Signature:**
```typescript
export interface MiddlewareCreationOptions
```
## Properties
| Property | Modifiers | Type | Description |
| --- | --- | --- | --- |
| [injectConfiguration?](./express.middlewarecreationoptions.injectconfiguration.md) | | boolean \| 'watch' | <p>_(Optional)_ A flag to control if configuration for the middleware can be injected lazily.</p><p>- <code>true</code> (default): creates a provider class with <code>@config</code> - <code>false</code>: No configuration injection is supported - 'watch': creates a provider class with <code>@config.view</code></p> |
| [providerClassName?](./express.middlewarecreationoptions.providerclassname.md) | | string | _(Optional)_ Class name for the created provider class. It's only used if <code>injectConfiguration</code> is not set to <code>false</code>. |