Very Basic GraphQL

graphql-basic.js

const {
  GraphQLObjectType,
  GraphQLString,
  GraphQLSchema,
  graphql
} = require('graphql');

const schema = new GraphQLSchema({
  query = new GraphQLObjectType({
    name: 'Query',
    fields: {
      helloWorld: {
        type: GraphQLString,
        description: 'Hello World field',
        resolve () {
          return 'Hello World'
        }
      }
    }
  })
});

const query = `
  query Hello {
    helloWorld
  }
`;

graphql(schema, query).then(result => console.log(result));