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---
lang: en
title: 'API docs: testlab.tojson_3'
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.tojson_3.html
---
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[Home](./index.md) > [@loopback/testlab](./testlab.md) > [toJSON](./testlab.tojson_3.md)
## toJSON() function
JSON encoding does not preserve properties that are undefined As a result, deepEqual checks fail because the expected model value contains these undefined property values, while the actual result returned by REST API does not. Use this function to convert a model instance into a data object as returned by REST API
**Signature:**
```typescript
export declare function toJSON(value: object): object;
```
## Parameters
<table><thead><tr><th>
Parameter
</th><th>
Type
</th><th>
Description
</th></tr></thead>
<tbody><tr><td markdown="1">
value
</td><td markdown="1">
object
</td><td markdown="1">
</td></tr>
</tbody></table>
**Returns:**
object