@loopback/docs/site/apidocs/core.lifecycleobserver.init.md

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---
lang: en
title: 'API docs: core.lifecycleobserver.init'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/core
permalink: /doc/en/lb4/apidocs.core.lifecycleobserver.init.html
---

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[Home](./index.md) &gt; [@loopback/core](./core.md) &gt; [LifeCycleObserver](./core.lifecycleobserver.md) &gt; [init](./core.lifecycleobserver.init.md)

## LifeCycleObserver.init() method

The method to be invoked during `init`<!-- -->. It will only be called at most once for a given application instance.

<b>Signature:</b>

```typescript
init?(...injectedArgs: unknown[]): ValueOrPromise<void>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  injectedArgs | unknown\[\] |  |

<b>Returns:</b>

[ValueOrPromise](./context.valueorpromise.md)<!-- -->&lt;void&gt;