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---
lang: en
title: 'API docs: socketio.socketiobooter._constructor_'
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.socketiobooter._constructor_.html
---
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[Home](./index.md) > [@loopback/socketio](./socketio.md) > [SocketIoBooter](./socketio.socketiobooter.md) > [(constructor)](./socketio.socketiobooter._constructor_.md)
## SocketIoBooter.(constructor)
Constructs a new instance of the `SocketIoBooter` class
**Signature:**
```typescript
constructor(app: Application, projectRoot: string, socketioControllerConfig: ArtifactOptions, socketioServer: SocketIoServer);
```
## Parameters
<table><thead><tr><th>
Parameter
</th><th>
Type
</th><th>
Description
</th></tr></thead>
<tbody><tr><td markdown="1">
app
</td><td markdown="1">
[Application](./core.application.md)
</td><td markdown="1">
</td></tr>
<tr><td markdown="1">
projectRoot
</td><td markdown="1">
string
</td><td markdown="1">
</td></tr>
<tr><td markdown="1">
socketioControllerConfig
</td><td markdown="1">
ArtifactOptions
</td><td markdown="1">
</td></tr>
<tr><td markdown="1">
socketioServer
</td><td markdown="1">
[SocketIoServer](./socketio.socketioserver.md)
</td><td markdown="1">
</td></tr>
</tbody></table>