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{
  book(id: "1") {
    id
    name
    genre
  }
}

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$ npm start

> server-graphql@1.0.0 start /Users/zegnus/Development/graph-ql-end-to-end-android/server-express-graphql
> nodemon server.js

[nodemon] 1.18.6
[nodemon] to restart at any time, enter `rs`
[nodemon] watching: *.*
[nodemon] starting `node server.js`
listening requests on 4000

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npm start

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module.exports = new GraphQLSchema({
    query: RootQuery
})

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book(id: "2") {
 name
 genre    
}

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RootQuery = new GraphQLObjectType({
    name: 'RootQueryType',
    fields: {
        book: {
            type: BookType,
            args: { id: { type: GraphQLString } },
            resolve(parent, args) {
                // find data
                return lodash.find(books, {id: args.id})
            }

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lodash = require('lodash')

var books = [
    { name: "Book 1", genre: 'Fantasy', id: '1' },
    { name: "Book 2", genre: 'Fantasy', id: '2' },
    { name: "Book 3", genre: 'Sci-Fi', id: '3' },
]

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BookType = new GraphQLObjectType({
    name: 'Book',
    fields: () => ({
        id: { type: GraphQLString },
        name: { type: GraphQLString },
        genre: { type: GraphQLString }
    })
})

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graphql = require('graphql')

const { 
    GraphQLObjectType, 
    GraphQLString, 
    GraphQLSchema
} = graphql;

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# Install node.js from https://nodejs.org/en/
mkdir server
cd server
npm init # yes to everything
npm install express
npm install nodemon # will restart the server automatically on any file change
npm install graphql express-graphql
npm install lodash # this will help with our in-memory database queries