---
lang: en
title: 'API docs: repository.modeldefinition.addproperty'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/repository
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 | string | Property definition or name (string) |
|  definitionOrType | [PropertyDefinition](./repository.propertydefinition.md) \| [PropertyType](./repository.propertytype.md) | Definition or property type |

<b>Returns:</b>

this


