How to fix Error: listen EADDRINUSE while using nodejs?

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If I run a server with the port 80, and I try to use xmlHTTPrequest i get this error: Error: listen EADDRINUSE

Why is it problem for nodejs, if I want to do a request, while I run a server on the port 80? For the webbrowsers it is not a problem: I can surf on the internet, while the server is running.

The server is:

  net.createServer(function (socket) {
    socket.name = socket.remoteAddress + ":" + socket.remotePort;
    console.log('connection request from: ' + socket.remoteAddress);
    socket.destroy();
  }).listen(options.port);

And the request:

var xhr = new XMLHttpRequest();

xhr.onreadystatechange = function() {
    sys.puts("State: " + this.readyState);

    if (this.readyState == 4) {
        sys.puts("Complete.\nBody length: " + this.responseText.length);
        sys.puts("Body:\n" + this.responseText);
    }
};

xhr.open("GET", "http://mywebsite.com");
xhr.send();

EADDRINUSE means that the port number which listen() tries to bind the server to is already in use.

So, in your case, there must be running a server on port 80 already.

If you have another webserver running on this port you have to put node.js behind that server and proxy it through it.

You should check for the listening event like this, to see if the server is really listening:

var http=require('http');

var server=http.createServer(function(req,res){
    res.end('test');
});

server.on('listening',function(){
    console.log('ok, server is running');
});

server.listen(80);

How to fix Error: listen EADDRINUSE while using nodejs ?, How to fix Error: listen EADDRINUSE while using nodejs? - If we run a server with the port 80, and we try to use xmlHTTPrequest we get this error: listen  EADDRINUSE means that the port number which listen() tries to bind the server to is already in use. EADDRINUSE. listen() So, in your case, there must be running a server on port 80 already. If you have another webserver running on this port you have to put node.js behind that server and proxy it through it.

What really helped for me was:

killall -9 node

But this will kill a system process.

With

ps ax

you can check if it worked.

Error: listen EADDRINUSE :::5000 · Issue #1050 · nodejs/help · GitHub, I am getting this error when starting up my server, regardless of po I am getting this error when starting up my server, regardless of port that I listen to in my node.js app. I have this same problem on my Linux server app.listen(9001 The most common issue here is running the same nodejs application twice lol. So double check to make sure you don’t have the same application already running. When you run into this problem there is another application/script running using the port number that nodejs wants to use.

The aforementioned killall -9 node, suggested by Patrick works as expected and solves the problem but you may want to read the edit part of this very answer about why kill -9 may not be the best way to do it.

On top of that you might want to target a single process rather than blindly killing all active processes.

In that case, first get the process ID (PID) of the process running on that port (say 8888):

lsof -i tcp:8888

This will return something like:

COMMAND   PID    USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
node     57385   You   11u  IPv6 0xac745b2749fd2be3      0t0  TCP *:ddi-tcp-1 (LISTEN)

Then just do (ps - actually do not. Please keep reading below):

kill -9 57385

You can read a bit more about this here.

EDIT: I was reading on a fairly related topic today and stumbled upon this interesting thread on why should i not kill -9 a process.

Generally, you should use kill -15 before kill -9 to give the target process a chance to clean up after itself. (Processes can't catch or ignore SIGKILL, but they can and often do catch SIGTERM.) If you don't give the process a chance to finish what it's doing and clean up, it may leave corrupted files (or other state) around that it won't be able to understand once restarted.

So, as stated you should better kill the above process with:

kill -15 57385

EDIT 2: As noted in a comment around here many times this error is a consequence of not exiting a process gracefully. That means, a lot of people exit a node command (or any other) using CTRL+Z. The correct way of stopping a running process is issuing the CTRL+C command which performs a clean exit.

Exiting a process the right way will free up that port while shutting down. This will allow you to restart the process without going through the trouble of killing it yourself before being able to re-run it again.

EADDRINUSE :::3000 error, NginxApacheNode.jsDebian. If I try to do “node <script” i am presented with this error log: Error: listen EADDRINUSE :::3000 the ports the services are listening on. So you're only interested in running a Node.js application ? You could further narrow down the list to only the processes listening on that port, by doing the following: lsof -n -i4TCP:[port-number] | grep LISTEN. Then kill that process.

Just a head's up, Skype will sometimes listen on port 80 and therefore cause this error if you try to listen on port 80 from Node.js or any other app.

You can turn off that behaviour in Skype by accessing the options and clicking Advanced -> Connection -> Use port 80 (Untick this)

P.S. After making that change, don't forget to restart Skype!

get Error: listen EADDRINUSE :::3000 but website seems ok, still , Error: listen EADDRINUSE :::3000 but after doing sudo lsof -iT. /questions/​9898372/how-to-fix-error-listen-eaddrinuse-while-using-nodejs. This edition of Manatee Mistakes is about the error I encountered: Error: listen EADDRINUSE :::8080 I was running node (or nodemon to be precise) in GitBash. I

You should try killing the process that is listening on port 80.

Killall will kill all the node apps running. You might not want to do that. With this command you can kill only the one app that is listening on a known port.

If using unix try this command:

sudo fuser -k 80/tcp    

How to fix `"Error: listen EADDRINUSE: address already in use , How to fix `"Error: listen EADDRINUSE: address already in use::: 8000"` while using nodejs in two steps. Chidera Paul Ugwuanyi's photo. Chidera Paul  Assuming you have the standard Pi install using the install script from the docs then it will be using systemd to start node red. When you run node-red-stop or start that is using the systemd script. That script will automatically restart node-red if it fails which explains why it keeps restarting.

How to fix Error: listen EADDRINUSE while using nodejs? – Website , Error: listen EADDRINUSE. Why is it problem for nodejs, if I want to do a request, while I run a server on the port 80? For the webbrowsers it is  app.listen(3000, function() { console.log('listening on 3000') }); The above code is for express but just check if you are trying to use the same port twice in your code.

How To Fix "Error: Listen EADDRINUSE" and "Error , Learn how to fix the error "Error: Listen EADDRINUSE" when you start your project, run that npm run start then get confronted with a nasty error message,  Node.js is an open source JavaScript runtime environment for easily building server-side and networking applications. Node.js applications can be run at the command line but this guide focuses on running them as a service using PM2, so that they will automatically restart on reboot or failure, and can safely be used in a production environment.

Learning programming: How to fix Error: listen EADDRINUSE while , [/code]The most common issue here is running the same nodejs application twice How to fix Error: listen EADDRINUSE while using Node.js? We get an EADDRINUSE issue. The problem is this: once the execution of the first test ends, the server is still listening on the port 3000. So when we require('../server') again in the second test file, it errors out because is port is still in use by the previous test file’s process.

Comments
  • Are you sure options.port is defined as 80? Is the XHR code running in a browser? Can you run "nc -l 0.0.0.0 80" when this server is not running?
  • See a similar issue at stackoverflow.com/questions/8553957/…
  • Which system are you on? Some systems require sudo if you want to listen to ports below a certain treshold.
  • this problem arises because you either ran your server on that port and you had not closed that port, the error clearly says that port is already in use this happens for me is when I open a new project in vs code without closing other projects(opening by drag and drop)
  • stackoverflow.com/questions/39632667/…
  • I run only this server. Befor I start the server, the xmlhttprequest works. After I start the server on the port 80, then the server also works perfectly. But if I do an xmlhttprequest after I started the server, then I get this error.
  • Won't this still throw an error if the server is already listening?
  • For me this was caused by Skype
  • Also for me. In my case I just run the listen function twice and got the error in the second
  • On a related note you may also read when should i not kil -9 a process.
  • The Issue here is you guys are not exiting the node process gracefully after the first run. Therefore, node is still binded to that port. ps aux | grep node would show that. Instead of killing the application with CTRL+Z, exit the application with CTRL+C. This exits the application gracefully and the port binding is removed.
  • Over 150 up-votes for a solution that equates to hitting your software with a mallet.