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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
**Signature:**
```typescript
static getNumberOfParameters(target: Object, member?: string): number;
```
## Parameters
<table><thead><tr><th>
Parameter
</th><th>
Type
</th><th>
Description
</th></tr></thead>
<tbody><tr><td markdown="1">
target
</td><td markdown="1">
Object
</td><td markdown="1">
Class or the prototype
</td></tr>
<tr><td markdown="1">
member
</td><td markdown="1">
string
</td><td markdown="1">
_(Optional)_ Method name
</td></tr>
</tbody></table>
**Returns:**
number