---
meta:
 - name: keywords
   description: api typescript node.js documentation requiredMapper function
---
# requiredMapper - @tsed/schema

## Usage

```typescript
import { requiredMapper } from "@tsed/schema";
```

> See [/packages/specs/schema/src/components/default/requiredMapper.ts](https://github.com/tsedio/tsed/blob/v8.27.0/packages/specs/schema/src/components/default/requiredMapper.ts#L0-L0).

## Overview

```ts
function requiredMapper(obj: any, schema: JsonSchema, options: JsonSchemaOptions): any;
```