@loopback/docs
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Documentation for LoopBack 4
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lang: en
title: 'API docs: boot.bootbindings.project_root'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.boot.bootbindings.project_root.html
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[Home](./index.md) > [@loopback/boot](./boot.md) > [BootBindings](./boot.bootbindings.md) > [PROJECT\_ROOT](./boot.bootbindings.project_root.md)
## BootBindings.PROJECT\_ROOT variable
Binding key for determining project root directory
<b>Signature:</b>
```typescript
PROJECT_ROOT: BindingKey<string>
```