Basic server with express

app.js

const express = require("express")
const logger = require("morgan")
require("dotenv").config()
const routes = require("./routes")

const app = express()
app.set("port", process.env.PORT || 8080)
app.use(express.json())
app.use(express.urlencoded({ extended: false }))

if (process.env.NODE_ENV == "production") {
	const accessLogStream = rfs("app.log", {
		size: "10M",
		interval: "1d"
	})
	app.use(logger("combined", { stream: accessLogStream }))
} else {
	app.use(logger("dev"))
}

app.use("/", routes)

app.use(async (err, req, res, next) => {
	const statusCode = res.statusCode || 500
	res.status(statusCode).json({ message: err.message })
})

module.exports = app

main.js

const app = require("./source/app")

const port = app.get("port")

app.listen(port, () => console.log(`Application running on port ${ port }`))

routes.js

const router = require("express").Router()

const greetings = [
	"Welcome to development world",
	"This is Fun!",
	"Development with node.js"
]

router.get("/", async (req, res) => {
	const message = greetings[ Math.floor(Math.random() * greetings.length) ]
	res.json({ message })
})

module.exports = router