server.js

const express = require("express");
const path = require('path');
const bodyParser = require('body-parser');
const cors = require("cors");
const cookieSession = require("cookie-session");

const dbConfig = require("./app/config/db.config");

const app = express();

app.use(cors({origin:true,credentials: true}));
// app.use(
//   cors({
//     credentials: true,
//     origin: ["http://localhost:3000"],
//   })
// );

// Parse incoming request bodies of type application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: true }));

app.use(bodyParser()) 
app.use(
  cookieSession({
    name: "session",
    keys: ["COOKIE_SECRET"], // should use as secret environment variable
    httpOnly: true
  })
);

const db = require("./app/models");
const Role = db.role;
db.mongoose
  .connect(dbConfig.url, {
    useNewUrlParser: true,
    useUnifiedTopology: true
  })
  .then(() => {
    console.log("Successfully connect to MongoDB.");
    initial();
  })
  .catch(err => {
    console.error("Connection error", err);
    process.exit();
  });

// simple route
app.get("/", (req, res) => {
  res.json({ message: "Welcome to bezkoder application." });
});


app.get("/upload/:filename", (req, res) => {
  const filename = req.params.filename;
  const imagePath = path.join(__dirname, "uploads", filename);
  res.sendFile(imagePath);
});

// routes
require("./app/routes/auth.routes")(app);
require("./app/routes/user.routes")(app);
require("./app/routes/category.routes")(app);
require("./app/routes/tag.routes")(app);
require("./app/routes/blog.routes")(app);

// set port, listen for requests
const PORT = process.env.PORT || 8080;
app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}.`);
});

function initial() {
  Role.estimatedDocumentCount((err, count) => {
    if (!err && count === 0) {
      new Role({
        name: "user"
      }).save(err => {
        if (err) {
          console.log("error", err);
        }

        console.log("added 'user' to roles collection");
      });

      new Role({
        name: "moderator"
      }).save(err => {
        if (err) {
          console.log("error", err);
        }

        console.log("added 'moderator' to roles collection");
      });

      new Role({
        name: "admin"
      }).save(err => {
        if (err) {
          console.log("error", err);
        }

        console.log("added 'admin' to roles collection");
      });
    }
  });
}