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

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[Home](./index.md) &gt; [@loopback/authentication](./authentication.md) &gt; [AUTHENTICATION\_METADATA\_KEY](./authentication.authentication_metadata_key.md)

## AUTHENTICATION\_METADATA\_KEY variable

The key used to store log-related via @<!-- -->loopback/metadata and reflection.

<b>Signature:</b>

```typescript
AUTHENTICATION_METADATA_KEY: MetadataAccessor<AuthenticationMetadata, MethodDecorator>
```

