---
lang: en
title: 'API docs: repository-json-schema.getjsonschemaref'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/repository-json-schema
permalink: /doc/en/lb4/apidocs.repository-json-schema.getjsonschemaref.html
---

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[Home](./index.md) &gt; [@loopback/repository-json-schema](./repository-json-schema.md) &gt; [getJsonSchemaRef](./repository-json-schema.getjsonschemaref.md)

## getJsonSchemaRef() function

Describe the provided Model as a reference to a definition shared by multiple endpoints. The definition is included in the returned schema.

**Signature:**

```typescript
export declare function getJsonSchemaRef<T extends object>(modelCtor: Function & {
    prototype: T;
}, options?: JsonSchemaOptions<T>): JsonSchema;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

modelCtor


</td><td markdown="1">

Function &amp; { prototype: T; }


</td><td markdown="1">

The model constructor (e.g. `Product`<!-- -->)


</td></tr>
<tr><td markdown="1">

options


</td><td markdown="1">

[JsonSchemaOptions](./repository-json-schema.jsonschemaoptions.md)<!-- -->&lt;T&gt;


</td><td markdown="1">

_(Optional)_ Additional options


</td></tr>
</tbody></table>

**Returns:**

JsonSchema

## Example


```ts
const schema = {
  $ref: '/definitions/Product',
  definitions: {
    Product: {
      title: 'Product',
      properties: {
        // etc.
      }
    }
  }
}
```