---
lang: en
title: 'API docs: authentication-jwt.jwtauthenticationstrategy.authenticate'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/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

**Signature:**

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

## Parameters

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

Parameter


</th><th>

Type


</th><th>

Description


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

request


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

Request


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


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

**Returns:**

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