---
lang: en
title: 'API docs: repository-json-schema.getjsonschema'
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.getjsonschema.html
---

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

## getJsonSchema() function

Gets the JSON Schema of a TypeScript model/class by seeing if one exists in a cache. If not, one is generated and then cached.

<b>Signature:</b>

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

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  ctor | Function &amp; { prototype: T; } | Constructor of class to get JSON Schema from |
|  options | [JsonSchemaOptions](./repository-json-schema.jsonschemaoptions.md)<!-- -->&lt;T&gt; | <i>(Optional)</i> |

<b>Returns:</b>

JsonSchema


