@loopback/docs/site/apidocs/context.context.isbound.md

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---
lang: en
title: 'API docs: context.context.isbound'
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.context.isbound.html
---

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[Home](./index.md) &gt; [@loopback/context](./context.md) &gt; [Context](./context.context.md) &gt; [isBound](./context.context.isbound.md)

## Context.isBound() method

Check if a key is bound in the context or its ancestors

<b>Signature:</b>

```typescript
isBound(key: BindingAddress): boolean;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  key | [BindingAddress](./context.bindingaddress.md) | Binding key |

<b>Returns:</b>

boolean