Zaim Sofia Zaim Sofia - 1 year ago 119
Node.js Question

private chat with

I'm having trouble with my chat app, I need to be able to send a private message to a specific user, I was able to select that specific user but for some reason couldn't figure out how to send the private message.

Below you will find the code for my server, please help:

var express = require('express');
var app = express();
var PORT = process.env.PORT || 8000;
var http = require('http').Server(app); // this is a node server that uses express as the boiler plate
var io = require('')(http); // socket! pass our server as a parameter to it

// use express static to expose a folder
app.use(express.static(__dirname + '/public'));

var users = [],
connections = [];
var onlineClients = {};

// Register events on socket connection
io.on('connection', function(socket){
// console.log("connected socket", connections);

socket.on("disconnect", function() {
users.splice(users.indexOf(socket.username), 1);
connections.splice(connections.indexOf(socket), 1);
console.log("disconnected socket", connections.length)

socket.on("send message", function(data) {
// console.log(data);
io.emit("new message", {msg: data, user: socket.username});

socket.on("notify user", function(data) {
io.emit("notify user", {user: socket.username})

socket.on("new user", function(data) {
socket.username = data;


function updateUsernames() {
io.emit("get users", users);

socket.on("private", function(data, recipientName) {
var recipient = connections.filter(function (recipient) {
return recipient.username === recipientName;
io.sockets.socket("received private msg", data);


// socket.on("create room", function(room) {
// socket.join(room);
//'event', "hey wusup am in this room");
// console.log(socket);

// })


http.listen(PORT, function(){
console.log('Server started on port ' + PORT);

Answer Source
  • First add user in chat room so that will easy to find a user in your private chat room
  • Your client side code for join private room

    <input type="text" class="form-control" id="user_email" placeholder="user_email" /> <button text="join room" class="btn btn-primary btn-block" onclick="a();"> Join Room</button>

  • your javascript code in client side

    function a(){ io.emit('privatechatrrom', {email:document.getElementById('user_email').value}); }

  • your server side code to add user in your room

    socket.on('privatechatroom',function(data){ socket.join(; io.emit('res',{mes:"you are added"}) });

now u can send private message to that person that is recently addedd to this room client side

function b()

/*serverside code*/socket.on('sendmail',function(data)
{'new_msg', {msg: data.message});
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