How can I integrate GraphQL with NestJS?

How can I integrate GraphQL with NestJS?

To integrate GraphQL with NestJS, you can use the @nestjs/graphql package. First, install it using npm.

What are the steps to set it up?

1. Install the necessary packages: npm install @nestjs/graphql graphql-tools graphql apollo-server-express.
2. Import GraphQLModule in your app module.
3. Define your GraphQL schema using decorators.

Can you show me a simple example of a resolver?

Sure! Here's a basic resolver:

import { Resolver, Query } from '@nestjs/graphql';

@Resolver()
export class AppResolver {
  @Query(() => String)
  getHello(): string {
    return 'Hello World!';
  }
}

What about error handling in GraphQL?

You can handle errors in GraphQL by using exception filters or by returning custom error messages in your resolvers.