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

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[Home](./index.md) &gt; [@loopback/authentication](./authentication.md) &gt; [AuthenticateActionProvider](./authentication.authenticateactionprovider.md) &gt; [action](./authentication.authenticateactionprovider.action.md)

## AuthenticateActionProvider.action() method

The implementation of authenticate() sequence action.

<b>Signature:</b>

```typescript
action(request: Request): Promise<UserProfile | undefined>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  request | Request | The incoming request provided by the REST layer |

<b>Returns:</b>

Promise&lt;[UserProfile](./security.userprofile.md) \| undefined&gt;


