Sample nodejs server

server.js

require("colors");
const express = require("express");
const logger = require("morgan");
const helmet = require("helmet");
const xss = require("xss-clean");
const hpp = require("hpp");
const mongoSanitize = require("express-mongo-sanitize");
const rateLimit = require("express-rate-limit");
const cors = require("cors");
const morgan = require("morgan");
const { PORT, NODE_ENV } = require("./src/config/config");
const connectToDb = require("./src/config/db");
const auth = require("./src/routes/auth.route");
const users = require("./src/routes/users.route");
const errorHandler = require("./src/middlewares/errorHandler");

// middlewares
const app = express();
app.use(express.json());
app.use(helmet());
app.use(mongoSanitize());
app.use(xss());
app.use(hpp());
app.use(cors());
app.use(logger("dev"));
const ratelimitoptions = {
  windowms: 11 * 60 * 1000,
  limit: 100,
  handler: (_req, res, _next, options) => {
    res
      .status(options.statuscode)
      .send({ success: false, error: options.message });
  },
};
app.use(rateLimit(ratelimitoptions));

// routes
app.use("/api/v1/auth", auth);
app.use("/api/v1/users", users);
app.use(errorHandler);

const main = () => {
  connectToDb();

  const server = app.listen(PORT || 5000, () =>
    console.log(
      `server listening in ${NODE_ENV} on port ${PORT || 5000}`.green.bold
    )
  );

  process.on("unhandledrejection", (err) => {
    console.log(`error : ${err.message}`.red.bold);
    server.close(() => process.exit(1));
  });
};

main();