@loopback/docs
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Documentation for LoopBack 4
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Markdown
lang: en
title: 'API docs: core.lifecycleobserver.start'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/packages/core
permalink: /doc/en/lb4/apidocs.core.lifecycleobserver.start.html
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[Home](./index.md) > [@loopback/core](./core.md) > [LifeCycleObserver](./core.lifecycleobserver.md) > [start](./core.lifecycleobserver.start.md)
## LifeCycleObserver.start() method
The method to be invoked during `start`
<b>Signature:</b>
```typescript
start?(): ValueOrPromise<void>;
```
<b>Returns:</b>
`ValueOrPromise<void>`