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lang: en
title: 'API docs: boot.bindingkeysexcludedfromsubapp'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/boot
permalink: /doc/en/lb4/apidocs.boot.bindingkeysexcludedfromsubapp.html
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[Home](./index.md) > [@loopback/boot](./boot.md) > [bindingKeysExcludedFromSubApp](./boot.bindingkeysexcludedfromsubapp.md)
## bindingKeysExcludedFromSubApp variable
Binding keys excluded from a sub application. These bindings booted from the sub application won't be added to the main application.
<b>Signature:</b>
```typescript
bindingKeysExcludedFromSubApp: string[]
```