using express js middlewares in apollo server graphql context

apollo-server-express-middlewares-example.js

import { ApolloServer, gql } from "apollo-server-micro"
import cookieSession from "cookie-session"

const ONE_HOUR = 60 * 60 * 1000

const typeDefs = gql`
  type Query {
    hello: String!
  }
`
const resolvers = {
  Query: {
    hello: (parent, args, { session }) => {
      
      // 3) session from cookieSession is now available to all resolvers through context and can be read or updated:
      
      session.views = (session.views || 0) + 1
      return `Hello! Views: ${session.views}`
    },
  },
}

const apolloServer = new ApolloServer({
  typeDefs,
  resolvers,
  context: ({ req, res }) => {
  
    // 1) We invoke the middleware with (req, res, () => {})
    
    cookieSession({
      name: "session",
      keys: ["key1", "key2"],
      maxAge: 24 * ONE_HOUR,
    })(req, res, () => {})
    
    // 2) req is now mutated by cookieSession (cookieSession adds .session to req)
    //    we can pass session to all resolvers through the context object:
    
    return { session: req.session }
  },
})

const handler = apolloServer.createHandler({ path: "/api/graphql" })

export const config = {
  api: {
    bodyParser: false,
  },
}

export default handler