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---
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
---
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
[Home](./index.md) > [@loopback/authentication-jwt](./authentication-jwt.md) > [JWTAuthenticationStrategy](./authentication-jwt.jwtauthenticationstrategy.md) > [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<[UserProfile](./security.userprofile.md) \| undefined>