---
lang: en
title: 'API docs: authentication-passport'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/extensions/authentication-passport
permalink: /doc/en/lb4/apidocs.authentication-passport.html
---

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[Home](./index.md) &gt; [@loopback/authentication-passport](./authentication-passport.md)

## authentication-passport package

An adapter to plug in passport based strategies to the authentication system in [@loopback/authentication @3.x](./authentication.md)<!-- -->.

## Remarks

[@loopback/authentication @3.x](./authentication.md) allows users to register authentication strategies that implement the interface `AuthenticationStrategy`<!-- -->.

Since AuthenticationStrategy describes a strategy with different contracts than the passport Strategy, and we'd like to support the existing 500+ community passport strategies, an adapter class is created in this package to convert a passport strategy to the one that LoopBack 4 authentication system wants.

## Classes

<table><thead><tr><th>

Class


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

[StrategyAdapter](./authentication-passport.strategyadapter.md)


</td><td markdown="1">

Adapter class to invoke passport-strategy 1. provides express dependencies to the passport strategies 2. provides shimming of requests for passport authentication 3. provides life-cycle similar to express to the passport-strategy 4. provides state methods to the strategy instance see: https://github.com/jaredhanson/passport


</td></tr>
</tbody></table>