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

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---
lang: en
title: 'API docs: metadata.metadatainspector.definemetadata'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
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editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/metadata
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---

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[Home](./index.md) &gt; [@loopback/metadata](./metadata.md) &gt; [MetadataInspector](./metadata.metadatainspector.md) &gt; [defineMetadata](./metadata.metadatainspector.definemetadata.md)

## MetadataInspector.defineMetadata() method

Define metadata for the given target

**Signature:**

```typescript
static defineMetadata<T>(key: MetadataKey<T, DecoratorType>, value: T, target: Object, member?: string): void;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

key


</td><td markdown="1">

[MetadataKey](./metadata.metadatakey.md)<!-- -->&lt;T, [DecoratorType](./metadata.decoratortype.md)<!-- -->&gt;


</td><td markdown="1">

Metadata key


</td></tr>
<tr><td markdown="1">

value


</td><td markdown="1">

T


</td><td markdown="1">

Metadata value


</td></tr>
<tr><td markdown="1">

target


</td><td markdown="1">

Object


</td><td markdown="1">

Target for the metadata


</td></tr>
<tr><td markdown="1">

member


</td><td markdown="1">

string


</td><td markdown="1">

_(Optional)_ Optional property or method name


</td></tr>
</tbody></table>

**Returns:**

void