GraphQLError: Query root type must be provided

Question

I’m using NestJS, TypeORM and GraphQL for my backend API. I’m getting the following error:

GraphQLError [Object]: Query root type must be provided.
      at SchemaValidationContext.reportError (/home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/graphql/type/validate.js:88:19)
      at validateRootTypes (/home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/graphql/type/validate.js:107:13)
      at validateSchema (/home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/graphql/type/validate.js:52:3)
      at graphqlImpl (/home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/graphql/graphql.js:79:62)
      at /home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/graphql/graphql.js:28:59
      at new Promise (<anonymous>)
      at Object.graphql (/home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/graphql/graphql.js:26:10)
      at GraphQLSchemaFactory.<anonymous> (/home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/@nestjs/graphql/dist/schema-builder/graphql-schema.factory.js:49:52)
      at Generator.next (<anonymous>)
      at /home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/tslib/tslib.js:114:75

This is what my file structure and code looks like:

Can someone please help me. My repo: https://github.com/wise-introvert/nestjs-graphql-api.git

Jay McDonielJay McDoniel 58.1k7 gold badges137 silver badges148 bronze badges · Accepted Answer · 2020-09-28 16:24:10Z

All servers running with GraphQL must have at least one @Query() to be considered a valid GraphQL server. Without it, the apollo-server package will throw an exception and the server will fail to start. This can be as simple as

@Resolver()
export class FooResolver {

  @Query(() => String)
  sayHello(): string {
    return 'Hello World!';
  }
}

I've added a dummy function under @Query decorator in my resolver but it's still throwing the same error. — Sep 28, 2020 at 16:29

score 52 · Accepted Answer · 2021-02-11 17:39:46Z

52

Also ensure the Resolver is added in the module providers

@Module({
  imports: [
    GraphQLModule.forRoot({
      installSubscriptionHandlers: true,
      autoSchemaFile: true,
    }),
  ],
  controllers: [],
  providers: [FooResolver], //< This
})
export class FooModule {}

edited Feb 11, 2021 at 17:39

answered Dec 4, 2020 at 13:19

Jonathan Turnock

8337 silver badges8 bronze badges

2

2

Thanks! This was the issue for me. The accepted answer did not solve the bug for me.

– Royal

Mar 29, 2021 at 7:42
What was missing for me was autoSchemaFile: true in the options object.

– Fernando Basso

Jun 23 at 11:45

ouflak 2,45810 gold badges44 silver badges49 bronze badges · Accepted Answer · 2021-10-14 09:32:44Z

This answer is not a direct answer to the question.

But if you are facing the described problem and the answers don’t help, recheck if you are using the correct imports:

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

// Incorrect in NestJS
import { Resolver, Query } from 'type-graphql';

YilmazYilmaz 36k11 gold badges157 silver badges206 bronze badges · Accepted Answer · 2022-04-23 18:51:38Z

In my case I had nfts.module.ts which is registered in app.module.ts but it was not configured properly. I had to pass providers

@Module({ providers: [NftsResolver, NftsService] })
export class NftsModule {}

Mike CaballeroMike Caballero 112 bronze badges · Accepted Answer · 2022-06-21 08:47:32Z

In my case, I forgot to add my resolver file on the providers array on my Module.

After running it again, everything went fine and schema.gql file was created at the same time.

Just make sure to add both Service and Resolver to your providers. 😀

icc97icc97 11.4k8 gold badges76 silver badges90 bronze badges · Accepted Answer · 2023-09-23 15:35:10Z

I hit this when working through the Nest.js GraphQL tutorial as ‘Schema first’.

As specified in the Schema first section of quick start, I still needed to set the typePaths and definitions options:

@Module({
  imports: [
    GraphQLModule.forRoot<ApolloDriverConfig>({
      driver: ApolloDriver,
      typePaths: ['./**/*.graphql'],
      definitions: {
        path: join(process.cwd(), 'src/graphql.ts'),
        outputAs: 'class',
      },
    }),
  ],
  controllers: [AppController],
  providers: [AppService],
})

This should then find any *.graphql file that you have created.

GraphQLError: Query root type must be provided