---
lang: en
title: 'API docs: context.bindingkey.validate'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/packages/context
permalink: /doc/en/lb4/apidocs.context.bindingkey.validate.html
---

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

## BindingKey.validate() method

Validate the binding key format. Please note that `#` is reserved. Returns a string representation of the binding key.

<b>Signature:</b>

```typescript
static validate<T>(key: BindingAddress<T>): string;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  key | <code>BindingAddress&lt;T&gt;</code> | Binding key, such as <code>a</code>, <code>a.b</code>, <code>a:b</code>, or <code>a/b</code> |

<b>Returns:</b>

`string`