@loopback/docs/site/apidocs/metadata.decoratorfactory._createdecorator.md

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---
lang: en
title: 'API docs: metadata.decoratorfactory._createdecorator'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
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[Home](./index.md) &gt; [@loopback/metadata](./metadata.md) &gt; [DecoratorFactory](./metadata.decoratorfactory.md) &gt; [\_createDecorator](./metadata.decoratorfactory._createdecorator.md)

## DecoratorFactory.\_createDecorator() method

Create a decorator function

<b>Signature:</b>

```typescript
protected static _createDecorator<S, MT extends S | MetadataMap<S> | MetadataMap<S[]>, DT extends DecoratorType>(key: MetadataKey<S, DT>, spec: S, options?: DecoratorOptions): DT;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  key | [MetadataKey](./metadata.metadatakey.md)<!-- -->&lt;S, DT&gt; | Metadata key |
|  spec | S | Metadata object from the decorator function |
|  options | [DecoratorOptions](./metadata.decoratoroptions.md) | Options for the decorator |

<b>Returns:</b>

DT