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---
lang: en
title: 'API docs: metadata.metadatainspector.getdesigntypeforproperty'
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.metadatainspector.getdesigntypeforproperty.html
---
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[Home](./index.md) > [@loopback/metadata](./metadata.md) > [MetadataInspector](./metadata.metadatainspector.md) > [getDesignTypeForProperty](./metadata.metadatainspector.getdesigntypeforproperty.md)
## MetadataInspector.getDesignTypeForProperty() method
Get TypeScript design time type for a property
**Signature:**
```typescript
static getDesignTypeForProperty(target: Object, propertyName: string): Function | undefined;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| target | Object | Class or prototype |
| propertyName | string | Property name |
**Returns:**
Function \| undefined
Design time metadata. The return value is `undefined` when: - The property has type `undefined`<!-- -->, `null` - The TypeScript project has not enabled the compiler option `emitDecoratorMetadata`<!-- -->. - The code is written in vanilla JavaScript.