---
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) &gt; [@loopback/core](./core.md) &gt; [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.

<b>Signature:</b>

```typescript
export interface Server extends LifeCycleObserver 
```
<b>Extends:</b> [LifeCycleObserver](./core.lifecycleobserver.md)

## Properties

|  Property | Modifiers | Type | Description |
|  --- | --- | --- | --- |
|  [listening](./core.server.listening.md) | <code>readonly</code> | boolean | Tells whether the server is listening for connections or not |