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Editorial Team
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Asked: 2026-06-09T02:19:48+00:00

My target: Create node.js server and client applications that will send antyhing (event, string,

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My target: Create node.js server and client applications that will send antyhing (event, string, function call) between two web browsers.

I installed and created simple server, but problems begin with creating a client. As said at http://socket.io/ I installed it by command:

npm install socket.io

but the file required in basic example:

<script src="/socket.io/socket.io.js"></script>

is not downloaded or installed. There is file named like that in /node_modules/socket.id/lib but is the same file ? I think that this is socket.io client but as module for server, not for web browser javascript right ?

How to get socket.io.js that just works and can connect to node.js server, without errors like io/socket/require is not defined etc. ?

I don’t want to create web serwer that responds to normal http requests. I want server that will hold connection and able to communicate between JS scripts in two browsers

I just can stand it, that everybody writes about node.js in form like everybody on the world has socket.io.js file in every possible direcortory. The possible duplicate:

socket.io.js not found

Starts with a function call require() that IS NOT in clean JavaScript API. So i don’t even try this sollution. Can anybody explain how to include and define io.* properly ? It is something about Express framework ? Why node.js and socket.id pages say nothing about express requirement ?

The problem is, that I need a CLIENT js library, and I don’t mean “client on server”, that my node binary server will have ability to connect to other pages/server and communicate. I mean client in HTML client page. And, if neccessary, other realted JS.

I grabbed a example from demo at http://serv1.aelag.com:8084/

/** Socket.IO 0.6.2 - Built with build.js */
/**
 * Socket.IO client
 * 
 * @author Guillermo Rauch <guillermo@learnboost.com>
 * @license The MIT license.
 * @copyright Copyright (c) 2010 LearnBoost <dev@learnboost.com>
 */

this.io = {
    version: '0.6.2',
...

How to get that file in normal way and not to steal from other server (maybe unstable or old version) ? And I need exaclty that file. Are there any dependencies ? Should I create it with building it “build.js” or developers did that ?

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1 Answer

  1. Editorial Team

    You do need to add /socket.io/socket.io.js anywhere. If you have installed socket.io via npm install socket.io your application knows how to handle it. I played around with socket.io myself a few months back and this is a very simple “chat” that I came up with and it worked. So it might help you out! (I am using ExpressJS. A very helpful Node.JS framework btw)

    This is you server side application:

    var app = require('express').createServer();
var io = require('socket.io').listen(app);

app.listen(3000);

app.get('/', function (req, res) {
  res.sendfile(__dirname + '/index.html');
});

io.sockets.on('connection', function (socket) {
    socket.on('news', function (data) {
        socket.emit('news', { content: data.text });
        socket.broadcast.emit('news', { content: data.text});
    });
});

    This is your index.html

    <!DOCTYPE html>
<html>
<head>
<title>socket test</title>
</head>
<body>
<input type="text" id="Username"> <input type="text" id="Content"><input type="button" value="send" onclick="sendMessage()"><br />
<script src="/socket.io/socket.io.js"></script>
<script>
  var socket = io.connect('http://localhost:3000/pathtoproject');
  socket.on('news', function (data) {
    document.body.innerHTML += data.content + "<br />";
  });
  function sendMessage() {
      socket.emit('news', { text: document.getElementById('Username').value + ": " + document.getElementById('Content').value });
  }
</script>
</body>
</html>
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