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

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[Home](./index.md) &gt; [@loopback/graphql](./graphql.md) &gt; [registerResolver](./graphql.registerresolver.md)

## registerResolver() function

Register a GraphQL resolver class

<b>Signature:</b>

```typescript
export declare function registerResolver(ctx: Context, resolverClass: Constructor<object>, nameOrOptions?: string | BindingFromClassOptions): Binding;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  ctx | [Context](./context.context.md) | Context object |
|  resolverClass | [Constructor](./context.constructor.md)<!-- -->&lt;object&gt; | Resolver class |
|  nameOrOptions | string \| [BindingFromClassOptions](./context.bindingfromclassoptions.md) | Resolver name or binding options |

<b>Returns:</b>

[Binding](./context.binding.md)


