node_http.js

var http = require('http'),
    url = require('url');
var todos = [{
    id: 1,
    title: 'aa',
    done: false
}, {
    id: 2,
    title: 'bb',
    done: true
}, {
    id: 3,
    title: 'cc',
    done: false
}],
    server = http.createServer();

var idRe = new RegExp('^/api/todo/([0-9]+)[^0-9]*$'),
    searchRe = new RegExp('^/api/todo/search.*$');

/*
extract POST data in node.js - 
var qs = require('querystring');
function (request, response) {
    if (request.method == 'POST') {
        var body = '';
        request.on('data', function (data) {
            body += data;
        });
        request.on('end', function () {
            var POST = qs.parse(body);
            // use POST
        });
    }
}
*/
/*
using express framework!
app.post('/', function(request, response){
    console.log(request.body.user.name);
    console.log(request.body.user.email);
});
*/
server.on('request', function(req, res) {
    res.setHeader('content-type', 'application/json');
    if (idRe.test(req.url)) {
        var parts = idRe.exec(req.url);
        // return the ID
        if (todos[parts[1]]) {
            res.end(JSON.stringify(todos[parts[1]]));
        }
    } else if (searchRe.test(req.url)) {
        var data = '';
        req.on('data', function(part) {
            data += part;
        });
        req.on('end', function() {
            var search = JSON.parse(data);
            // search the todos array by key - value pair
            res.end(JSON.stringify(
            todos.filter(function(item) {
                return Object.keys(search).every(function(key) {
                    return item[key] && item[key] == search[key];
                });
            })));
        });
    } else {
        console.log('Unknown', req.url);
        res.end();
    }
});