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---
lang: en
title: 'API docs: authentication.authenticationmiddlewareprovider._constructor_'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/authentication
permalink: /doc/en/lb4/apidocs.authentication.authenticationmiddlewareprovider._constructor_.html
---
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
[Home](./index.md) > [@loopback/authentication](./authentication.md) > [AuthenticationMiddlewareProvider](./authentication.authenticationmiddlewareprovider.md) > [(constructor)](./authentication.authenticationmiddlewareprovider._constructor_.md)
## AuthenticationMiddlewareProvider.(constructor)
Constructs a new instance of the `AuthenticationMiddlewareProvider` class
**Signature:**
```typescript
constructor(authenticate: AuthenticateFn);
```
## Parameters
<table><thead><tr><th>
Parameter
</th><th>
Type
</th><th>
Description
</th></tr></thead>
<tbody><tr><td markdown="1">
authenticate
</td><td markdown="1">
[AuthenticateFn](./authentication.authenticatefn.md)
</td><td markdown="1">
</td></tr>
</tbody></table>