@loopback/docs/site/apidocs/authentication-jwt.jwtauthenticationstrategy.authenticate.md

Documentation for LoopBack 4

---
lang: en
title: 'API docs: authentication-jwt.jwtauthenticationstrategy.authenticate'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/extensions/authentication-jwt
permalink: /doc/en/lb4/apidocs.authentication-jwt.jwtauthenticationstrategy.authenticate.html
---

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[Home](./index.md) &gt; [@loopback/authentication-jwt](./authentication-jwt.md) &gt; [JWTAuthenticationStrategy](./authentication-jwt.jwtauthenticationstrategy.md) &gt; [authenticate](./authentication-jwt.jwtauthenticationstrategy.authenticate.md)

## JWTAuthenticationStrategy.authenticate() method

<b>Signature:</b>

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

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  request | <code>Request</code> |  |

<b>Returns:</b>

`Promise<UserProfile | undefined>`