@loopback/docs/site/apidocs/metadata.namespacedreflect.definemetadata.md

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---
lang: en
title: 'API docs: metadata.namespacedreflect.definemetadata'
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[Home](./index.md) &gt; [@loopback/metadata](./metadata.md) &gt; [NamespacedReflect](./metadata.namespacedreflect.md) &gt; [defineMetadata](./metadata.namespacedreflect.definemetadata.md)

## NamespacedReflect.defineMetadata() method

define metadata for a target class or it's property/method

<b>Signature:</b>

```typescript
defineMetadata(metadataKey: string, metadataValue: any, target: Object, propertyKey?: string): void;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  metadataKey | string |  |
|  metadataValue | any |  |
|  target | Object |  |
|  propertyKey | string |  |

<b>Returns:</b>

void