@loopback/docs/site/apidocs/testlab.testsandbox.writejsonfile.md

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

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[Home](./index.md) &gt; [@loopback/testlab](./testlab.md) &gt; [TestSandbox](./testlab.testsandbox.md) &gt; [writeJsonFile](./testlab.testsandbox.writejsonfile.md)

## TestSandbox.writeJsonFile() method

Creates a new file and writes the given data serialized as JSON.

<b>Signature:</b>

```typescript
writeJsonFile(dest: string, data: unknown): Promise<void>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  dest | string | Destination filename, optionally including a relative path. |
|  data | unknown | The data to write. |

<b>Returns:</b>

Promise&lt;void&gt;