graphql.js

'use strict';

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

const Query = new GraphQLObjectType({
  name: 'Query',
  description: 'The root type defines how GraphQL operations begin. It is the entry point to constructing GraphQL queries.',
  fields: () => ({
    hello: {
      type: GraphQLString,
      args: {
        name: { type:GraphQLString }
      },
      resolve: (root, args, context) => args.name
    }
  })
});

const Mutation = new GraphQLObjectType({
  name: 'Mutation',
  description: 'The mutation type defines how GraphQL operations change data.',
  fields: () => ({
    hello: {
      type: GraphQLString,
      args: {
        name: { type:GraphQLString }
      },
      resolve:(root, args, context) => args.name
    }
  })
});

const schema = new GraphQLSchema({ query:Query, mutation:Mutation });

const query = `
  query {
    hello(name: "world")
  }
`;

graphql(schema, query).then(result => console.log('query:', JSON.stringify(result, null, 2)));

const mutation = `
  mutation {
    hello(name: "world")
  }
`;

graphql(schema, mutation).then(result => console.log('mutation:', JSON.stringify(result, null, 2)));