@loopback/docs/site/apidocs/authentication.authentication_metadata_key.md

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---
lang: en
title: 'API docs: authentication.authentication_metadata_key'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
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editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/authentication
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

Alias for AUTHENTICATION\_METADATA\_METHOD\_KEY to keep it backward compatible

<b>Signature:</b>

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