@loopback/docs/site/apidocs/repository.modeldefinition.addproperty.md

Documentation for LoopBack 4

---
lang: en
title: 'API docs: repository.modeldefinition.addproperty'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.repository.modeldefinition.addproperty.html
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[Home](./index.md) &gt; [@loopback/repository](./repository.md) &gt; [ModelDefinition](./repository.modeldefinition.md) &gt; [addProperty](./repository.modeldefinition.addproperty.md)

## ModelDefinition.addProperty() method

Add a property

<b>Signature:</b>

```typescript
addProperty(name: string, definitionOrType: PropertyDefinition | PropertyType): this;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  name | <code>string</code> | Property definition or name (string) |
|  definitionOrType | <code>PropertyDefinition &#124; PropertyType</code> | Definition or property type |

<b>Returns:</b>

`this`