graphql-js-schema.js

import {
  GraphQLSchema,
  GraphQLObjectType,
  GraphQLNonNull,
  GraphQLInt,
  GraphQLID,
  GraphQLString } from 'graphql';

import rp from 'request-promise';

const Person = new GraphQLObjectType{
  name: "User",
  fields: {
    id: { type: GraphQLID }
    name: { type: GraphQLString },
    age: { type: GraphQLInt }
  }
};

const Query = new GraphQLObjectType({
  name: 'Query',
  fields: {
    person: {
      type: Person,
      args: {
        id: { type: new GraphQLNonNull(GraphQLID) },
      },
      description: 'Get user by ID',
      resolve: (root, { id }) => {
        return rp(`https://some-backend.com/person/${id}`)
               .then( res => JSON.parse(res) );
      },
    },
  }
});

const Schema = new GraphQLSchema({
  query: Query
});