---
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/strongloop/loopback-next/tree/master/packages/metadata
permalink: /doc/en/lb4/apidocs.metadata.decoratorfactory.getnumberofparameters.html
---

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[Home](./index.md) &gt; [@loopback/metadata](./metadata.md) &gt; [DecoratorFactory](./metadata.decoratorfactory.md) &gt; [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