App.js

const express =  require('express');
const bodyParser = require ('body-parser');
const { graphqlHTTP } = require('express-graphql');
const mongoose = require('mongoose');

const graphqlSchema = require('./graphql/schema/index');
const graphqlResolvers = require('./graphql/resolvers/index');
const isAuth = require('./middleware/is-auth');

const app = express();

app.use(bodyParser.json());

app.use((req, res, next)=>{
    res.setHeader('Access-Control-Allow-Origin', '*');
    res.setHeader('Access-Control-Allow-Method', 'POST,GET,OPTIONS');
    res.setHeader('Access-Control-Allow-Headers', 'Content-Type, Authorization');
    if(req.method === 'OPTIONS') {
        return res.sendStatus(200);
    }
    next();
})

app.use(isAuth);

app.use('/api/v1', graphqlHTTP({
    schema: graphqlSchema,
    rootValue: graphqlResolvers ,
    graphiql : true
}));

/* DataBase Config */
const db = require('./config/keys').mongoURI;

/* Connect to MongoDB */
mongoose
    .connect(db, {
        useNewUrlParser: true,
        useUnifiedTopology: true,
        useFindAndModify: false
    })
    .then(() => console.log('MongoDB Connected'))
    .catch(err => console.log(err));


const port = process.env.PORT || 3000;

app.listen(port, () => console.log(`Server running on port ${port}`));