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lang: en
title: 'API docs: rest.defaultsequence.invokemiddleware'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/rest
permalink: /doc/en/lb4/apidocs.rest.defaultsequence.invokemiddleware.html
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[Home](./index.md) > [@loopback/rest](./rest.md) > [DefaultSequence](./rest.defaultsequence.md) > [invokeMiddleware](./rest.defaultsequence.invokemiddleware.md)
## DefaultSequence.invokeMiddleware property
Optional invoker for registered middleware in a chain. To be injected via SequenceActions.INVOKE\_MIDDLEWARE.
<b>Signature:</b>
```typescript
protected invokeMiddleware: InvokeMiddleware;
```