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

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

## socketio.subscribe() function

Decorate a method to subscribe to socketio events. For example,

```ts
@socketio.subscribe('chat message')
async function onChat(msg: string) {
}
```

**Signature:**

```typescript
function subscribe(...messageTypes: (string | RegExp)[]): MethodDecorator;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

messageTypes


</td><td markdown="1">

(string \| RegExp)\[\]


</td><td markdown="1">


</td></tr>
</tbody></table>

**Returns:**

MethodDecorator