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

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[Home](./index.md) &gt; [@loopback/context](./context.md) &gt; [ContextObserver](./context.contextobserver.md)

## ContextObserver interface

Observers of context bind/unbind events

**Signature:**

```typescript
export interface ContextObserver 
```

## Properties

|  Property | Modifiers | Type | Description |
|  --- | --- | --- | --- |
|  [filter?](./context.contextobserver.filter.md) |  | [BindingFilter](./context.bindingfilter.md) | _(Optional)_ An optional filter function to match bindings. If not present, the listener will be notified of all binding events. |
|  [observe](./context.contextobserver.observe.md) |  | [ContextObserverFn](./context.contextobserverfn.md) | Listen on <code>bind</code>, <code>unbind</code>, or other events |