@loopback/docs/site/apidocs/rest.routingtable.registercontroller.md

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

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[Home](./index.md) &gt; [@loopback/rest](./rest.md) &gt; [RoutingTable](./rest.routingtable.md) &gt; [registerController](./rest.routingtable.registercontroller.md)

## RoutingTable.registerController() method

Register a controller as the route

**Signature:**

```typescript
registerController<T extends object>(spec: ControllerSpec, controllerCtor: ControllerClass<T>, controllerFactory?: ControllerFactory<T>): void;
```

## Parameters

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

Parameter


</th><th>

Type


</th><th>

Description


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

spec


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

[ControllerSpec](./openapi-v3.controllerspec.md)


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


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

controllerCtor


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

[ControllerClass](./rest.controllerclass.md)<!-- -->&lt;T&gt;


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


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

controllerFactory


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

[ControllerFactory](./rest.controllerfactory.md)<!-- -->&lt;T&gt;


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

_(Optional)_


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

**Returns:**

void