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---
lang: en
title: 'API docs: rest.getcontenttype'
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.getcontenttype.html
---
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
[Home](./index.md) > [@loopback/rest](./rest.md) > [getContentType](./rest.getcontenttype.md)
## getContentType() function
Get the content-type header value from the request
**Signature:**
```typescript
export declare function getContentType(req: Request): string | undefined;
```
## Parameters
<table><thead><tr><th>
Parameter
</th><th>
Type
</th><th>
Description
</th></tr></thead>
<tbody><tr><td markdown="1">
req
</td><td markdown="1">
Request
</td><td markdown="1">
Http request
</td></tr>
</tbody></table>
**Returns:**
string \| undefined