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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
---
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
[Home](./index.md) > [@loopback/context](./context.md) > [Context](./context.context.md) > [isBound](./context.context.isbound.md)
## Context.isBound() method
Check if a key is bound in the context or its ancestors
**Signature:**
```typescript
isBound(key: BindingAddress): boolean;
```
## Parameters
<table><thead><tr><th>
Parameter
</th><th>
Type
</th><th>
Description
</th></tr></thead>
<tbody><tr><td markdown="1">
key
</td><td markdown="1">
[BindingAddress](./context.bindingaddress.md)
</td><td markdown="1">
Binding key
</td></tr>
</tbody></table>
**Returns:**
boolean