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Documentation for LoopBack 4
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lang: en
title: 'API docs: context.context.issubscribed'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.context.context.issubscribed.html
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[Home](./index.md) > [@loopback/context](./context.md) > [Context](./context.context.md) > [isSubscribed](./context.context.issubscribed.md)
## Context.isSubscribed() method
Check if an observer is subscribed to this context
<b>Signature:</b>
```typescript
isSubscribed(observer: ContextObserver): boolean;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| observer | <code>ContextObserver</code> | Context observer |
<b>Returns:</b>
`boolean`