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lang: en
title: 'API docs: health.readycheck'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/extensions/health
permalink: /doc/en/lb4/apidocs.health.readycheck.html
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[Home](./index.md) > [@loopback/health](./health.md) > [ReadyCheck](./health.readycheck.md)
## ReadyCheck type
Functions for readiness check
**Signature:**
```typescript
export type ReadyCheck = () => Promise<void>;
```