@loopback/docs/site/apidocs/boot.bootbindings.bootstrapper_key.md

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---
lang: en
title: 'API docs: boot.bootbindings.bootstrapper_key'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
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editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/boot
permalink: /doc/en/lb4/apidocs.boot.bootbindings.bootstrapper_key.html
---

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[Home](./index.md) &gt; [@loopback/boot](./boot.md) &gt; [BootBindings](./boot.bootbindings.md) &gt; [BOOTSTRAPPER\_KEY](./boot.bootbindings.bootstrapper_key.md)

## BootBindings.BOOTSTRAPPER\_KEY variable

Binding key for binding the BootStrapper class

<b>Signature:</b>

```typescript
BOOTSTRAPPER_KEY: BindingKey<Bootstrapper>
```