---
lang: en
title: 'API docs: context.bindingkey.deepproperty'
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.bindingkey.deepproperty.html
---

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[Home](./index.md) &gt; [@loopback/context](./context.md) &gt; [BindingKey](./context.bindingkey.md) &gt; [deepProperty](./context.bindingkey.deepproperty.md)

## BindingKey.deepProperty() method

Get a binding address for retrieving a deep property of the object bound to the current binding key.

**Signature:**

```typescript
deepProperty<PropertyValueType>(propertyPath: string): BindingKey<PropertyValueType>;
```

## Parameters

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

Parameter


</th><th>

Type


</th><th>

Description


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

propertyPath


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

string


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

A dot-separated path to a (deep) property, e.g. "server.port".


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

**Returns:**

[BindingKey](./context.bindingkey.md)<!-- -->&lt;PropertyValueType&gt;