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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) &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;