---
lang: en
title: 'API docs: socketio'
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.html
---

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

## socketio package

[@loopback/socketio](https://github.com/loopbackio/loopback-next/tree/master/extensions/socketio)

## Classes

|  Class | Description |
|  --- | --- |
|  [DefaultSocketIoSequence](./socketio.defaultsocketiosequence.md) |  |
|  [SocketIoApplication](./socketio.socketioapplication.md) |  |
|  [SocketIoBooter](./socketio.socketiobooter.md) | A class that extends [BaseArtifactBooter](./boot.baseartifactbooter.md) to boot the  artifact type. |
|  [SocketIoComponent](./socketio.socketiocomponent.md) |  |
|  [SocketIoConnectionContext](./socketio.socketioconnectioncontext.md) | Request context for a socket.io request |
|  [SocketIoControllerFactory](./socketio.socketiocontrollerfactory.md) | A factory to instantiate socket.io controllers |
|  [SocketIoInvokeMethodProvider](./socketio.socketioinvokemethodprovider.md) |  |
|  [SocketIoRejectProvider](./socketio.socketiorejectprovider.md) |  |
|  [SocketIoSendProvider](./socketio.socketiosendprovider.md) |  |
|  [SocketIoServer](./socketio.socketioserver.md) | A socketio server |

## Functions

|  Function | Description |
|  --- | --- |
|  [getSocketIoMetadata(controllerClass)](./socketio.getsocketiometadata.md) |  |
|  [socketio(spec)](./socketio.socketio.md) | Decorate a socketio controller class to specify the namespace. |

## Interfaces

|  Interface | Description |
|  --- | --- |
|  [HttpServerResolvedOptions](./socketio.httpserverresolvedoptions.md) | Valid configuration for the HttpServer constructor. |
|  [SocketIoMetadata](./socketio.socketiometadata.md) | Metadata for SocketIo |
|  [SocketIoSequence](./socketio.socketiosequence.md) |  |
|  [SocketIoServerOptions](./socketio.socketioserveroptions.md) |  |

## Namespaces

|  Namespace | Description |
|  --- | --- |
|  [socketio](./socketio.socketio.md) |  |
|  [SocketIoBindings](./socketio.socketiobindings.md) |  |
|  [SocketIoTags](./socketio.socketiotags.md) |  |

## Variables

|  Variable | Description |
|  --- | --- |
|  [ERR\_NO\_MULTI\_SERVER](./socketio.err_no_multi_server.md) |  |
|  [getNamespaceKeyForName](./socketio.getnamespacekeyforname.md) |  |
|  [SOCKET\_IO\_CONNECT\_METADATA](./socketio.socket_io_connect_metadata.md) |  |
|  [SOCKET\_IO\_METADATA](./socketio.socket_io_metadata.md) |  |
|  [SOCKET\_IO\_SUBSCRIBE\_METADATA](./socketio.socket_io_subscribe_metadata.md) |  |
|  [SocketIoControllerDefaults](./socketio.socketiocontrollerdefaults.md) | Default ArtifactOptions for SocketIoControllerBooter. |
|  [socketIoControllers](./socketio.socketiocontrollers.md) | A binding filter to match socket.io controllers |

## Type Aliases

|  Type Alias | Description |
|  --- | --- |
|  [SocketIoDoneFunction](./socketio.socketiodonefunction.md) |  |
|  [SocketIoInvokeMethod](./socketio.socketioinvokemethod.md) |  |
|  [SocketIoOptions](./socketio.socketiooptions.md) |  |
|  [SocketIoRejectMethod](./socketio.socketiorejectmethod.md) |  |
|  [SocketIoSendMethod](./socketio.socketiosendmethod.md) |  |
|  [SockIOMiddleware](./socketio.sockiomiddleware.md) |  |