---
lang: en
title: 'API docs: authentication.userservice.verifycredentials'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.authentication.userservice.verifycredentials.html
---

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[Home](./index.md) &gt; [@loopback/authentication](./authentication.md) &gt; [UserService](./authentication.userservice.md) &gt; [verifyCredentials](./authentication.userservice.verifycredentials.md)

## UserService.verifyCredentials() method

Verify the identity of a user, construct a corresponding user profile using the user information and return the user profile.

<b>Signature:</b>

```typescript
verifyCredentials(credentials: C): Promise<U>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  credentials | <code>C</code> | Credentials for basic auth or configurations for 3rd party. Example see the |

<b>Returns:</b>

`Promise<U>`

## Example

A pseudo code for basic authentication:

```ts
verifyCredentials(credentials: C): Promise<U> {
  // the id field shouldn't be hardcoded
  user = await UserRepo.find(credentials.id);
  matched = await passwordService.compare(user.password, credentials.password);
  if (matched) return user;
  // throw a JS error, agnostic of the client type
  throw new Error('authentication failed');
};

```
A pseudo code for 3rd party authentication:

```ts
type UserInfo = {
  accessToken: string;
  refreshToken: string;
  userProfile: string;
};
verifyCredentials(credentials: C): Promise<U> {
  try {
    userInfo: UserInfo = await getUserInfoFromFB(credentials);
  } catch (e) {
    // throw a JS error, agnostic of the client type
    throw e;
  }
};

```


