---
lang: en
title: 'API docs: core.lifecycleobserverfilter'
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.lifecycleobserverfilter.html
---

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[Home](./index.md) &gt; [@loopback/core](./core.md) &gt; [lifeCycleObserverFilter](./core.lifecycleobserverfilter.md)

## lifeCycleObserverFilter variable

Find all life cycle observer bindings. By default, a binding tagged with `CoreTags.LIFE_CYCLE_OBSERVER`<!-- -->. It's used as `BindingFilter`<!-- -->.

<b>Signature:</b>

```typescript
lifeCycleObserverFilter: BindingTagFilter
```

