Express Graphql Server

GraphQL Types

• String
• Int
• Float
• Boolean
• ID
• Query
• Mutation
• ???

Query Type

const typeDefs =  type Query { greeting: String! } ;

Mutation Type

const typeDefs =  type Mutation { setGreetingMessage(message: String!): String } ;

Resolvers

let greetingMsg = "Hello, world!";

const resolvers = { Query: { greeting () => greetingMsg; } },

Mutation: { setGreetingMessage }

function setGreetingMessage(_, { message }) { return greetingMsg = message; }

function(obj, args, context, info)

Express/Apollo Server

const express = require('express'); const { ApolloServer } = require('apollo-server-express');

// import typeDefs and resolvers or define here...

const app = express();

const server = new ApolloServer({ typeDefs, resolvers, });

server.applyMiddleware({ app, path: '/graphql' });

app.listen(3000, function () { console.log('App Started on port 3000); });

DEMO

Thank You!