BasicRouter.js

'use strict';

const http = require('http');
const url = require('url');
const qs = require('querystring');

let routes = {
	'GET': {
		'/': (req, res) => {
			res.writeHead(200, {'Content-type': 'text/html'});
			res.end('<h1>Hello Router</h1>');
		},
		'/about': (req, res) => {
			res.writeHead(200, {'Content-type': 'text/html'});
			res.end('<h1>This is about page</h1>');
		},
		'/api/getinfo': (req, res) => {
			res.writeHead(200, {'Content-type': 'application/json'});
			res.end(JSON.stringify(req.queryParams));
		}
	},
	'POST': {
		'/api/login': (req, res) => {
			let body = '';
			req.on('data', data => {
				body += data;
				if(body.length > 2097152){
					res.writeHead(413, {'Content-type': 'text/html'});
					res.end('<h3>Error: The file been uploaded exceeds the 2MB limit!');
					res.connection.destroy();
				}
			});
			
			req.on('end', () => {
				let params = qs.parse(body);
				console.log('Username:', params['username']);
				console.log('Password:', params['password']);
				res.end();
			});
		}
	},
	'NA': (req, res) => {
		res.writeHead(404);
		res.end('Content not found!')
	}
}

function router(req,res){
	let baseURI = url.parse(req.url,true);
	let resoveRoute = routes[req.method][baseURI.pathname];
	if(resoveRoute != undefined){
		req.queryParams = baseURI.query;
		resoveRoute(req,res);
	} else {
		routes['NA'](req,res);
	}
}

http.createServer(router).listen(3000, () => {
	console.log('Surver running on port 3000');
});