Untitled

var http = require("http");
var fs=require('fs');
var path=require('path');
var msg= "hinhow r u ?nfine";
var file='textms.txt';
http.createServer(function (req,res){
    fs.open(file,function(exists){
        if(exists){
            fs.open(file,msg,function(err){
                if(err)throw err;
            });
        }else{
            fs.writeFile('test.txt',msg);
            console.log('New file is created : ');
        }

    });
    res.end();
}).listen(8080);

console.log('server running on port 8080');

<html>
    <head>
        <title>
            Chat Test With Nodejs
        </title>
    <script type="text/javascript" src="server.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
    </head>
    <body>
    <div id="cnt"></div>
    <input type="text" class="text">
    <button id="btn">Send</button>
    </body>
</html>

Uncaught ReferenceError: require is not defined @ server.js:1