@loopback/docs/site/apidocs/rest.parsejson.md

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

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[Home](./index.md) &gt; [@loopback/rest](./rest.md) &gt; [parseJson](./rest.parsejson.md)

## parseJson() function

Parse a json string that rejects prohibited keys

**Signature:**

```typescript
export declare function parseJson(text: string, reviver?: (key: any, value: any) => any, prohibitedKeys?: string[]): any;
```

## Parameters

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

Parameter


</th><th>

Type


</th><th>

Description


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

text


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

string


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

JSON string


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

reviver


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

(key: any, value: any) =&gt; any


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

_(Optional)_ Optional reviver function for `JSON.parse`


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

prohibitedKeys


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

string\[\]


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

_(Optional)_ An array of keys to be rejected


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

**Returns:**

any