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Documentation for LoopBack 4
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lang: en
title: 'API docs: rest.controllerfactory'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.rest.controllerfactory.html
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[Home](./index.md) > [@loopback/rest](./rest.md) > [ControllerFactory](./rest.controllerfactory.md)
## ControllerFactory type
A factory function to create controller instances synchronously or asynchronously
<b>Signature:</b>
```typescript
export declare type ControllerFactory<T extends ControllerInstance> = (ctx: Context) => ValueOrPromise<T>;
```