@loopback/docs/site/apidocs/socketio.sockiomiddleware.md

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---
lang: en
title: 'API docs: socketio.sockiomiddleware'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/extensions/socketio
permalink: /doc/en/lb4/apidocs.socketio.sockiomiddleware.html
---

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[Home](./index.md) &gt; [@loopback/socketio](./socketio.md) &gt; [SockIOMiddleware](./socketio.sockiomiddleware.md)

## SockIOMiddleware type

<b>Signature:</b>

```typescript
export declare type SockIOMiddleware = (socket: Socket, fn: (err?: any) => void) => void;
```