server.js

const { readdirSync } = require("fs");
const mongoose = require("mongoose");
const path = require("path");
require("dotenv").config();
require("express-async-errors"); //no need any try catch for this package
const express = require("express");
const app = express();
const morgan = require("morgan");
const scheduleTask = require("./utils/scheduler");

// swagger
const swaggerUI = require("swagger-ui-express");
const YAML = require("yamljs");
const swaggerDocument = YAML.load("./swagger.yaml");

let globalRequestCount = 0;
// // global counter middleware
const globalRequestCounter = (req, res, next) => {
  globalRequestCount++;
  next();
};
// // Reset the global counter every minute
scheduleTask("1m", async () => {
  globalRequestCount = 0;
});

// extra security packages
const helmet = require("helmet");
const cors = require("cors");
const xss = require("xss-clean");
const rateLimiter = require("express-rate-limit");

app.set("trust proxy", 1);
// globalRequestCounter middleware
app.use(globalRequestCounter);
app.use(
  rateLimiter({
    windowMs: 60 * 1000, // 1 minute
    max: 10, // limit each IP to 10 requests per windowMs
    handler: (req, res) => {
      // show the global request count value
      res.status(429).json({
        error: "Too Many Requests,Try Again After Some Time",
        requestCount: globalRequestCount,
      });
    },
  })
);
app.use(express.json());
app.use(morgan("dev"));
app.use(cors());
app.use(xss());
app.use(express.urlencoded({ extended: false }));
app.use(helmet({ crossOriginResourcePolicy: false }));

// error handler
const notFoundMiddleware = require("./middleware/not-found");
const errorHandlerMiddleware = require("./middleware/error-handler");


// routes middleware
readdirSync("./routes").map((r) =>
  app.use("/api/v1", require(`./routes/${r}`))
);

// routes
app.get("/", (req, res) => {
  res.send('<h1>Store API</h1><a href="/api-docs">Documentation</a>');
});
app.use('/api-docs', swaggerUI.serve, swaggerUI.setup(swaggerDocument));

//db connection
const connectDB = require("./db/connect");

//if no route found
app.use(notFoundMiddleware);
//if error found custom error handler
app.use(errorHandlerMiddleware);

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

const start = async () => {
  try {
    await connectDB(process.env.MONGO_URI);
    app.listen(port, () =>
      console.log(`Server is listening on port ${port}...`)
    );
  } catch (error) {
    console.log(error);
  }
};

start();