如何修复“错误：监听 EADDRINUSE：地址已在使用中：：：5000”未处理的“错误”事件

Question

i create a nodejs server (a loginapp) but when i try to node app a error (she was not here before) came out:

events.js:167
      throw er; // Unhandled 'error' event
      ^

Error: listen EADDRINUSE: address already in use :::5000
    at Server.setupListenHandle [as _listen2] (net.js:1290:14)
    at listenInCluster (net.js:1338:12)
    at Server.listen (net.js:1425:7)
    at Function.listen (C:\Users\Corentin\Documents\loginapp\node_modules\express\lib\application.js:618:24)
    at Object.<anonymous> (C:\Users\Corentin\Documents\loginapp\app.js:81:5)
    at Module._compile (internal/modules/cjs/loader.js:689:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
    at Module.load (internal/modules/cjs/loader.js:599:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
    at Function.Module._load (internal/modules/cjs/loader.js:530:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:742:12)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3)
Emitted 'error' event at:
    at emitErrorNT (net.js:1317:8)
    at process._tickCallback (internal/process/next_tick.js:63:19)
    at Function.Module.runMain (internal/modules/cjs/loader.js:745:11)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3)

I think there is a link with mongo but i didnt see the error,

This is my app.js code (NOT FULL) ask me if you need more of my code

var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var exphbs = require('express-handlebars');
var expressValidator = require('express-validator');
var bodyParser = require('body-parser');
var flash = require('connect-flash');
var session = require('express-session');
var passport = require('passport');
var LocalStrategy = require('passport-local'),Strategy;
var mongo = require('mongodb');
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/loginapp', { useNewUrlParser: true });
var db = mongoose.connection;

var routes = require('./routes/index');
var users = require('./routes/users');

// APP INIT
var app = express();

// VIEW ENGINE
app.set('views', path.join(__dirname,'views'));
app.engine('handlebars', exphbs({ defaultLayout:'layout' }));
app.set('view engine','handlebars');

app.use('/', routes);
app.use('/users', users);

// SET PORT
app.set('port', (5000));

app.listen(app.get('port'), () => {
    console.log('Server lancé sur le port ' + app.get('port'));
});

This is my users.js file

var express = require('express');
var router = express.Router();
var bodyParser = require('body-parser');

var User = require('../models/user');

// REGISTER
router.get('/register', (req, res) => {
    res.render('register');
});

// LOGIN
router.get('/login', (req, res) => {
    res.render('login');
});

// REGISTER
router.post('/register', (req, res) => {
    var name = req.body.name;
    var username = req.body.username;
    var email = req.body.email;
    var password = req.body.password;
    var password2 = req.body.password2;

    // VALIDATION
    req.checkBody('name','Name is required').notEmpty();
    req.checkBody('username','Username is required').notEmpty();
    req.checkBody('email','Email is required').notEmpty();
    req.checkBody('email','Email is not valid').isEmail();
    req.checkBody('password','Password is required').notEmpty();
    req.checkBody('password2','Passwords do not match').equals(req.body.password);

    var errors = req.validationErrors();

    if(errors) {
        res.render('register', {
            errors:errors
        });
    } else {
        var newUser = new User({
            name: name,
            username: username,
            email: email,
            password: password
        });

        User.createUser(newUser, function(err, user) {
            if(err) throw err;
            console.log(user);
        });

        req.flash('success_msg', 'You are now registered and u can log');

        res.redirect('/users/login');
    }
});

module.exports = router;

And the user.js file

var mongoose = require('mongoose');
var bcrypt = require('bcryptjs');

// USER SCHEMA
var UserSchema = mongoose.Schema({
    username: {
        type: String,
        index: true
    },
    name: {
        type: String
    },
    email: {
        type: String
    },
    password: {
        type: String
    }
});

var User = module.exports = mongoose.model('User', UserSchema);

module.exports.createUser = function(newUser, callback) {
    bcrypt.genSalt(10, function(err, salt) {
        bcrypt.hash(newUser.password, salt, function(err, hash) {
            newUser.password = hash;
            newUser.save(callback);
        });
    });
}

Thank a lot to the person who can help me !

Answer 1

Try this one

sudo lsof -i :5000

COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
node 20152 abc 21u IPv6 195004 0t0 TCP *:http (LISTEN)

sudo kill -9 20152

Answer 2

这对我有用：

sudo killall -9 node

Answer 3

Your express server tries to open Port 500

app.set('port', (5000));

And the error message suggests, that this port is already in use.

You can either change the port of the express server or find the application that uses port 5000 and see if you can change the port there.

Does this help?

Answer 4

我发现fuser -k 5000/tcp是杀死特定端口上的进程的最快速方法。

Answer 5

You should try :

netstat -lpn | grep 5000

and then :

kill -9 PID

Answer 6

I had this error and what I did wrong was I declared the app.listen() twice and hence the port was already in use. Make sure you only do it once.

Answer 7

你有两个终端打开，并连接到端口 5000，杀死一个！

Answer 8

restart your laptop/server, it will release all the busy ports, then try again...u can also use

ps aux | grep node

and then kill the process using:

kill -9 PID

but most of the times it wont work for nodemon, and didnt work for me.

Answer 9

I know this is an old thread, but maybe someone will find this useful.

In order to be more efficient, I added the following bash script to an alias in bashrc file, so I don't have to type lsof -i:5000 , then copy the PID, then run kill -9 PID .

In the .bashrc (you can find it normally in the path ~/.bashrc ), put somewhere inside it the following:

alias k5k='lsof -t -i:5000 | xargs kill -9'

I named this alias k5k for "kill 5 thousand(k)", but you name it whatever you want.

Then you can just type k5k and it will kill all instances running on port 5000.

Answer 10

this error is showing because your mongodb is running... ie mongod. so first exit from that and then restart your visual studio code.. it will definetly work.

Answer 11

Try sudo pkill node . Don't forget to use sudo permission. It's really worked for me.

I tried kill -9 PID . but it reoccurs on every rs .

Answer 12

Specific port running checker

sudo netstat -lpn |grep :5000

tcp6 | 0 | 0 :::5000 | :::* | LISTEN | 6782/java

kill 6782

--------------------- OR ---------------------

sudo lsof -t -i:5000

sudo kill -9 $(sudo lsof -t -i:5000)

Answer 13

I just restart the terminal and run again:

npm start

it will work fine again

(I'm using ubuntu terminal)

Answer 14

on windows:

1. Run the cmd as administrator (hold ctl + shift while clicking on it - or right-click and choose Run as Administrator )
2. Run the command below to find the PID of the process:

netstat -ano|findstr "PID :8081"  // replace 8081 with your in-use port 

You'll get a result like:

3. Run the following command using the target PID number:

// replace 1500 with your target PID

taskkill /pid 1500 /f 

Answer 15

netstat -ano | findstr:5000 netstat -ano | findstr:5000 and after this simply, type taskkill /F /PID yourNumber(11076)

then start, server use: npm run dev

Answer 16

I just close all the windows of IDE or command prompt and restart the machine. It worked fine for me. Hopefully, there's some random program running on that specific port.

Answer 17

sudo lsof -t -i tcp:portNumber | xargs kill -9

This will work if your portNumber is already in use with another app.js file.

Answer 18

This is the Error that happens when we are using the same port number in another websites or you are trying to run the application in the terminal at the same time that application was running on another terminal . For me, The Situation was that I was already running the node Application in my terminal But I am trying to run it again using npm start command on the other terminal so that it shows this error. Solution: You can check whether your application is running or not in the terminal or command prompt. If it was running then you can quit it and run it again then it will be working fine.

Answer 19

If you are on a mac port 5000 will by default be used by AirPlay .

To turn AirPlay off and thereby free up port 5000:

1. System Preferences
2. Sharing
3. Untick AirPlay in the left column

This has fixed the problem for me.

MacBook Air 2020
Apple M1
macOS Monterey 12.6
16/256GB