morgan npm

var express = require("express");
var fs = require("fs");
var morgan = require("morgan");
var path = require("path");

var app = express();

// create a write stream (in append mode)
var accessLogStream = fs.createWriteStream(path.join(__dirname, "access.log"), {
  flags: "a",
});

// setup the logger
app.use(morgan("combined", { stream: accessLogStream }));

app.get("/", function (req, res) {
  res.send("hello, world!");
});