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---
lang: en
title: 'API docs: core.server'
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.server.html
---
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[Home](./index.md) > [@loopback/core](./core.md) > [Server](./core.server.md)
## Server interface
Defines the requirements to implement a Server for LoopBack applications: start() : Promise<void> stop() : Promise<void> It is recommended that each Server implementation creates its own child Context, which inherits from the parent Application context. This way, any Server-specific bindings will remain local to the Server instance, and will avoid polluting its parent module scope.
**Signature:**
```typescript
export interface Server extends LifeCycleObserver
```
**Extends:** [LifeCycleObserver](./core.lifecycleobserver.md)
## Properties
<table><thead><tr><th>
Property
</th><th>
Modifiers
</th><th>
Type
</th><th>
Description
</th></tr></thead>
<tbody><tr><td markdown="1">
[listening](./core.server.listening.md)
</td><td markdown="1">
`readonly`
</td><td markdown="1">
boolean
</td><td markdown="1">
Tells whether the server is listening for connections or not
</td></tr>
</tbody></table>