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Documentation for LoopBack 4
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Markdown
lang: en
title: 'API docs: authentication.tokenservice.verifytoken'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.authentication.tokenservice.verifytoken.html
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[Home](./index.md) > [@loopback/authentication](./authentication.md) > [TokenService](./authentication.tokenservice.md) > [verifyToken](./authentication.tokenservice.verifytoken.md)
## TokenService.verifyToken() method
Verifies the validity of a token string and returns a user profile
<b>Signature:</b>
```typescript
verifyToken(token: string): Promise<UserProfile>;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| token | <code>string</code> | |
<b>Returns:</b>
`Promise<UserProfile>`