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lang: en
title: 'API docs: repository.belongstodefinition.keyfrom'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/packages/repository
permalink: /doc/en/lb4/apidocs.repository.belongstodefinition.keyfrom.html
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[Home](./index.md) > [@loopback/repository](./repository.md) > [BelongsToDefinition](./repository.belongstodefinition.md) > [keyFrom](./repository.belongstodefinition.keyfrom.md)
## BelongsToDefinition.keyFrom property
<b>Signature:</b>
```typescript
keyFrom?: string;
```