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Documentation for LoopBack 4
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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) > [@loopback/authentication](./authentication.md) > [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>
```