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lang: en
title: 'API docs: metadata.decoratorfactory.getnumberofparameters'
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.getnumberofparameters.html
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[Home](./index.md) > [@loopback/metadata](./metadata.md) > [DecoratorFactory](./metadata.decoratorfactory.md) > [getNumberOfParameters](./metadata.decoratorfactory.getnumberofparameters.md)
## DecoratorFactory.getNumberOfParameters() method
Get the number of parameters for a given constructor or method
<b>Signature:</b>
```typescript
static getNumberOfParameters(target: Object, member?: string): number;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| target | Object | Class or the prototype |
| member | string | Method name |
<b>Returns:</b>
number