---
lang: en
title: 'API docs: core.application.setstate'
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.application.setstate.html
---

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[Home](./index.md) &gt; [@loopback/core](./core.md) &gt; [Application](./core.application.md) &gt; [setState](./core.application.setstate.md)

## Application.setState() method

Transition the application to a new state and emit an event

**Signature:**

```typescript
protected setState(state: string): void;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

state


</td><td markdown="1">

string


</td><td markdown="1">

The new state


</td></tr>
</tbody></table>

**Returns:**

void