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Asked: 2026-05-31T18:10:32+00:00

// Server.js var http = require(‘http’); var path = require(‘path’); var fs = require(‘fs’);

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// Server.js

var http = require('http');
var path = require('path');
var fs = require('fs');

http.createServer(function (request, response) {

    console.log('request starting...');

    var filePath = '.' + request.url;
    if (filePath == './')
        filePath = './index.html';

    path.exists(filePath, function(exists) {

        if (exists) {
            fs.readFile(filePath, function(error, content) {
                if (error) {
                    response.writeHead(500);
                    response.end();
                }
                else {
                    response.writeHead(200, { 'Content-Type': 'text/html' });
                    response.end(content, 'utf-8');
                }
            });
        }
        else {
            response.writeHead(404);
            response.end();
        }
    });

}).listen(8125);

console.log('Server running at http://127.0.0.1:8125/');

// index.html

<html>
    <head>
        <title>Rockin' Page</title>
        <link type="text/css" rel="stylesheet" href="style.css" />
        <script type="text/javascript" src="jquery-1.7.1.min.js"></script>   
        </head>
    <body>
        <p>This is a page. For realz, yo.</p>
    </body>
    <script type="text/javascript">
        $(document).ready(function() {
            alert('happenin');
        });
    </script>
</html>

I am able to run my static page, but i have couple of questions down the line.

  1. What do i do next? i mean what to develop and what to learn? i am confused.. what is the difference i am doing with my current webserver.
  2. Is node.js just an replacement of my Apache Webserver.
  3. Can anyone clearly explain me the main purpose of nodejs
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1 Answer

  1. Editorial Team

    Questions

    1. What do i do next? i mean what to develop and what to learn? i am confused.. what is the difference i am doing with my current webserver.
    2. Is node.js just an replacement of my Apache Webserver.
    3. Can anyone clearly explain me the main purpose of nodejs

    Answers

    1. Start with some simple examples and/or tutorials. I’ve forked Mastering Node on github, which is a quick read but is also still a work in progress. I’ve used expressjs for quickly creating static sites (like my online resume). I also use node.js and nodeunit for testing JavaScript or performing scripting tasks that could otherwise be done in bash, php, batch, perl, etc.

    2. node.js gives an IO wrapper to Google’s V8 JavaScript engine. This means that JavaScript is not bound to a web browser and can interact with any type of IO. That means files, sockets, processes (phihag’s Turing-complete answer). It can do pretty much anything.

    3. The main purpose of nodejs is that IO code is evented and (mostly) non-blocking. For example, in ASP.NET, when a web server receives a request that request’s thread is blocked until all processing is complete (unless processed by an asynchronous handler, which is the exception not the rule). In node.js (express, railwayjs, etc.), the request processing is handled by events and callbacks. Code is executed asynchronously and callbacks are executed when complete. This is similar to the asynchronous pages of ASP.NET, the main difference being that node.js and web frameworks on top of it don’t create millions of threads. I believe the threading issue is discussed in Ryan’s video.

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