Mahdi.Pishguy Mahdi.Pishguy -5 years ago 307
Node.js Question

Nodejs get throw er; // Unhandled 'error' event

this is my firs program on

and i', trying to use
on that. after create simple project as below code, i get

throw er; // Unhandled 'error' event

error, i'm google more tutorials but i cant find whats my code problem

install packages:

"name": "signalAndroidServerApplication",
"version": "0.0.0",
"private": true,
"dependencies": {
"body-parser": "~1.12.4",
"cookie-parser": "~1.3.5",
"express": "~4.12.4",
"": "latest"

my nodejs:

var socket = require('');
var express = require('express');
var app = express();
var server = require('http').createServer(app);
var io = socket.listen(server);
var port = process.env.PORT || 3000;

server.listen(port, function () {
console.log('Server listening at port %d', port);

io.on('connection', function (socket) {
socket.on('new_count_message', function (data) {
console.log('new_count_message' + data);
io.sockets.emit('new_count_message', {
new_count_message: data.new_count_message

full error:

throw er; // Unhandled 'error' event
Error: listen EADDRINUSE
at errnoException (net.js:901:11)
at Server._listen2 (net.js:1039:14)
at listen (net.js:1061:10)
at Server.listen (net.js:1135:5)
at Object.<anonymous> (/var/www/signal/nodeJs/server.js:8:8)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)

Answer Source

Error: listen EADDRINUSE means that the port you're trying to run on is already being used.

Try changing to it to use another port.

So var port = process.env.PORT || 3000; change this to var port = process.env.PORT || 4000; and hit localhost:4000

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