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---
lang: en
title: 'API docs: context.contextsubscriptionmanager.issubscribed'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/context
permalink: /doc/en/lb4/apidocs.context.contextsubscriptionmanager.issubscribed.html
---
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[Home](./index.md) > [@loopback/context](./context.md) > [ContextSubscriptionManager](./context.contextsubscriptionmanager.md) > [isSubscribed](./context.contextsubscriptionmanager.issubscribed.md)
## ContextSubscriptionManager.isSubscribed() method
Check if an observer is subscribed to this context
**Signature:**
```typescript
isSubscribed(observer: ContextObserver): boolean;
```
## Parameters
<table><thead><tr><th>
Parameter
</th><th>
Type
</th><th>
Description
</th></tr></thead>
<tbody><tr><td markdown="1">
observer
</td><td markdown="1">
[ContextObserver](./context.contextobserver.md)
</td><td markdown="1">
Context observer
</td></tr>
</tbody></table>
**Returns:**
boolean