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Documentation for LoopBack 4
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lang: en
title: 'API docs: core.lifecycleobserverregistry.start'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.core.lifecycleobserverregistry.start.html
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[Home](./index.md) > [@loopback/core](./core.md) > [LifeCycleObserverRegistry](./core.lifecycleobserverregistry.md) > [start](./core.lifecycleobserverregistry.start.md)
## LifeCycleObserverRegistry.start() method
Notify all life cycle observers by group of `start`
<b>Signature:</b>
```typescript
start(): Promise<void>;
```
<b>Returns:</b>
`Promise<void>`