server.js

    const express    = require('express')
    const bodyParser = require('body-parser')
    const { graphqlExpress } = require('apollo-server-express')
    const schema = require('./schema')
    const jwt = require('express-jwt')

    const app = express()

    // bodyparser
    app.use(bodyParser.json())

    // authentication middleware
    const authMiddleware = jwt({
      secret: 'somesuperdupersecret'
    })

    app.use(authMiddleware)

    app.use('/api', graphqlExpress(req => ({
      schema,
      context: {
        user: req.user
      }
    })))

    app.listen(3000, () => {
      console.log('Server is up on 3000')
    })