Nodemon: Error: listen EADDRINUSE: address already in use :::5000

问题

I'm creating a project and using nodejs, express for the backend. Everything works fine but as I make any change in the file, nodemon is unable to restart the server due to following error:

Error: listen EADDRINUSE: address already in use :::5000

index.js:

const express = require("express");
const morgan = require("morgan");
const mongoose = require("mongoose");
const cookieParser = require("cookie-parser");
const session = require("express-session");
const FileStore = require("session-file-store")(session);
const dotenv = require("dotenv");
var passport = require("passport");

dotenv.config();

const PORT = process.env.PORT || 5000;

const app = express();

.....

app.listen(PORT, () => console.log(`Server listening on port ${PORT}!`));

package.json

{
  "name": "chat-app-backend",
  "version": "0.0.0",
  "private": true,
  "scripts": {
    "start": "node index.js",
    "dev": "nodemon --ignore 'sessions/' index.js"
  },
  "dependencies": {
    "bcryptjs": "^2.4.3",
    "cookie-parser": "^1.4.5",
    "cors": "^2.8.5",
    "debug": "~2.6.9",
    "dotenv": "^8.2.0",
    "express": "~4.16.0",
    "express-session": "^1.17.0",
    "http-errors": "~1.6.2",
    "jade": "~1.11.0",
    "jsonwebtoken": "^8.5.1",
    "mongoose": "^5.9.4",
    "morgan": "~1.9.0",
    "passport": "^0.4.1",
    "passport-jwt": "^4.0.0",
    "passport-local": "^1.0.0",
    "passport-local-mongoose": "^6.0.1",
    "session-file-store": "^1.4.0",
    "uuid": "^7.0.2"
  },
  "devDependencies": {
    "nodemon": "^2.0.2"
  }
}

I've to explicitly kill the server from the terminal every time, which is not the optimal solution. I tried several things, but none are working. Even found some issue in nodemon GitHub issue page, but there also I couldn't find anything.

I'm also adding the output of lsof -i:5000, even if server I'm closing the server - node 31625 rishav 20u IPv6 5300049 0t0 TCP *:5000 (LISTEN)

回答1:

Your port is used somewhere else. Most likely, you forgot to stop previous instance of node before running new one.

回答2:

You can try running your server on some other port like 3000.

If you still want to use the same port, then you can use the following command to get the list of running process on that particular port:

lsof -i tcp:3000

Use following command in terminal to kill that running port

sudo kill -9 $(lsof -i tcp: 3000 -t)

回答3:

I got:

Error: listen EADDRINUSE: address already in use :::8000

I was trying to look for the process listening to port 8000
and had no luck - there were none (sudo netstat -nlp | grep 8000 ).

It turned out I had app.listen(8000) written twice in my script.

My assumption is that the interference was happening only in a short time when trying to run the script, so looking for processes listening to the port before and after error didn't show any.

回答4:

I had the same situation. If you are using Visual Studio Code, check your terminals. You might have other instances of the terminal that is already running your node server.

回答5:

If you don't want to go through strange git commands, you can simply restart your computer and run your app again.

来源：https://stackoverflow.com/questions/61181302/nodemon-error-listen-eaddrinuse-address-already-in-use-5000

标签

javascript

node.js

express

nodemon