@loopback/docs/site/apidocs/context.bindingkey.create.md

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

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

## BindingKey.create() method

Create a new key for a binding bound to a value of type `ValueType`<!-- -->.

**Signature:**

```typescript
static create<V>(key: string, propertyPath?: string): BindingKey<V>;
```

## 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">

string


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

The binding key. When propertyPath is not provided, the key is allowed to contain propertyPath as encoded via `BindingKey#toString()`


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

propertyPath


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

string


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

_(Optional)_ Optional path to a deep property of the bound value.


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

**Returns:**

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

## Example


```ts
BindingKey.create<string>('application.name');
BindingKey.create<number>('config', 'rest.port);
BindingKey.create<number>('config#rest.port');
```