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title: 'API docs: metadata.decoratorfactory.withtarget'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/metadata
permalink: /doc/en/lb4/apidocs.metadata.decoratorfactory.withtarget.html
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[Home](./index.md) > [@loopback/metadata](./metadata.md) > [DecoratorFactory](./metadata.decoratorfactory.md) > [withTarget](./metadata.decoratorfactory.withtarget.md)
## DecoratorFactory.withTarget() method
Set a reference to the target class or prototype for a given spec if it's an object
<b>Signature:</b>
```typescript
withTarget(spec: T, target: Object): T;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| spec | T | Metadata spec |
| target | Object | Target of the decoration. It is a class or the prototype of a class. |
<b>Returns:</b>
T