Node js express error listen eaddrinuse

Cannot catch listen() addressinuse error. #2856

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I’ve tried everything i found online,

  • try-catch around listen()
  • listen().on(‘error’, .
  • process.on(‘uncaughtException .

How do I catch the address in use error?? (express 4.x)

The text was updated successfully, but these errors were encountered:

Just wondering, why do you want to catch it? Isn’t better if you «let it go»

I want to bunyan-log the error and then throw it

What version of Node.js are you using? With Express 4.13.3 on Node.js 0.12.1, I found your second option worked for me.

Simple test

Output I get

The Server object is a Node.js EventEmitter. As with all EventEmitter’s, most errors are passed to the ‘error’ event. If no handler is registered for the ‘error’ event, those bubble up to be thrown. try/catch does not work because when listen is attempted, any errors that occur are caught and emitted on the ‘error’ event using process.nextTick() — that is, by the time the error is actually reported, the try/catch block has already exited. As a fallback, you can register an ‘uncaughtException’ handler on process as a catch all for any unhandled errors that occur on any EventEmitter object, but it’s best to simply set the ‘error’ callback on the server object. @tunniclm’s example ought to work for you.

The «proper» way to do this is:

Make the server yourself and bind the event before you start listening.

Hey guys,
it seems that running my server with «nodemon» causes different outcome than with «node».

  • with nodeamon index.js I get the exception thrown to the console, and my error handler is not called
  • with node index.js I get my handler called

anyone have any idea why?

I’m not that familiar with nodeamon but I would guess that it’s likely hooking in it’s own event listeners and taking actions before yours get a chance to fire.

I suspect that nodemon adds some error handler and handle the error for you (restart the process or wait for changes etc..). I took a quick look at the source code of nodemon, and found several places
For example https://github.com/remy/nodemon/blob/2f19ffb5a7162d08abbabea45ed995ac2cd9511a/lib/monitor/run.js#L101 and this https://github.com/remy/nodemon/blob/f5d1a04cc80f1bc963c20627177e545be42aeee7/lib/monitor/watch.js#L78

If you want to further investigate this issue, those two might contain some clues

Guys thanks for the help!

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Fixing nodemon ‘Error: listen EADDRINUSE: address in use’

Has this ever happened to you?

You go to start up your server with npm start and you get the below error message

Exit fullscreen mode

Luckily there is a solution!

This error occurs when a process is already running on the port you’re trying to use. All you need to do is kill that process. In this case, since the port we want to use is 3000 we could simply paste and execute the below code in our terminal.

Exit fullscreen mode

This will kill the process running on port 3000 and you should be good to start your server with npm start like usual.

Save this command for future use

If this happens often, it’s a great idea to add an alias to bash for reuse anytime. The below code is a function that accepts a port number to kill and when saved can be reused for any port number.

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The quick and easy way to save

Simply execute the below command and the killport function will be available every time you open bash. Just remember to restart your terminal for the saved function to be loaded after first adding it.

Exit fullscreen mode

Below is an example of how the newly defined killport function can be used to kill a process on port 3000.

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The slightly more advanced way to save

To save this function alongside your other bash aliases and configurations you just need to add the below code to

/.bash_aliases which can be accomplished using vim

/.bashrc and pasting in the code snippet.

Источник

Как исправить ошибку: слушать EADDRINUSE при использовании nodejs?

Если я запускаю сервер с портом 80, и я пытаюсь использовать xmlHTTPrequest, я получаю эту ошибку: Error: listen EADDRINUSE

Почему это проблема для nodejs, если я хочу выполнить запрос, когда я запускаю сервер на порту 80? Для веб-браузеров это не проблема: я могу заниматься серфингом в Интернете, пока сервер работает.

35 ответов

EADDRINUSE означает, что номер порта, который listen() пытается связать сервер, уже используется.

Итак, в вашем случае должен быть запущен сервер на порту 80.

Если у вас есть другой веб-сервер, работающий на этом порту, вы должны поместить node.js за этот сервер и прокси-сервер через него.

Вы должны проверить событие listening , подобное этому, чтобы узнать, действительно ли сервер прослушивает:

Что действительно помогло мне:

Но это убьет системный процесс.

вы можете проверить, не сработало ли оно.

Вышеупомянутый killall -9 node , предложенный Патриком, работает так, как ожидалось, и решает проблему, но вы можете прочитать часть редактирования этого самого ответа о том, почему kill -9 может быть не лучшим способом сделать это.

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Кроме того, вы можете настроить таргетинг на одиночный процесс, а не слепо убивать активные все.

В этом случае сначала получите идентификатор процесса (PID) процесса, запущенного на этом порту (скажем, 8888):

Это вернет что-то вроде:

Тогда просто сделайте (ps — на самом деле не. Пожалуйста, продолжайте читать ниже):

Вы можете прочитать немного об этом здесь.

РЕДАКТИРОВАТЬ: Я читал по довольно смежной теме сегодня и наткнулся на этот интересный поток на почему я не kill -9 процесс.

Как правило, вы должны использовать kill -15 до kill -9, чтобы дать целевому процессу возможность очистить после себя. (Процессы не могут поймать или игнорировать SIGKILL, но они могут и часто блокировать SIGTERM.) Если вы не дадите процессу возможность закончить то, что он делает и очистит, он может оставить поврежденные файлы (или другое состояние) вокруг что он не сможет разобраться после перезапуска.

Итак, как сказано, вам лучше убить описанный выше процесс:

РЕДАКТИРОВАТЬ 2: как отмеченный в комментарии здесь, эта ошибка является следствием не изящного выхода из процесса. Это означает, что многие люди выходят из команды node (или любой другой), используя CTRL + Z. Правильный способ остановки запущенного процесса — выдать команду CTRL + C, которая выполняет чистый выход.

Выход из процесса правильным способом освободит этот порт при выключении. Это позволит вам перезапустить процесс, не переживая проблемы с его убийством, прежде чем сможет снова запустить его.

Источник

Error: listen EADDRINUSE: address already in use . 5000 #1849

Comments

  • nodemon -v : 2.0.7
  • node -v : 14.16.01
  • Operating system/terminal environment: MacOS Big Sur
  • Using Docker? No
  • Command you ran: nodemon server

Expected behaviour

Close port before reinitializing server.

Actual behaviour

Steps to reproduce

  1. Initialize app (basic MERN app)
  2. Save any file.
  3. Error is thrown.

This only started happening after I updated my Mac to Big Sur. I can circumvent this issue by either stopping the app and killing the port or by saving a second time a couple of seconds after the first crashed the server.

The text was updated successfully, but these errors were encountered:

Can you explain and provide example code? Because I’m pretty sure «basic» actually means: set up mongodb, add nginx, possibly webpack and a bunch others. i.e. not compatible with «basic».

If you can provide code that replicates this issue, happy to look at it. Otherwise this is too vague.

server.js roughly looks like this:

Okay, start striping the code back until you have the bare minimum and you can still replicate, then post that here, then we can take a look.

I’ve recently started facing the same issue on my own application. Nodemon was working fine all this while but now seems to be leaving a single Node process listening on an open port (3000, in my case). I looked up past issues on the GitHub repo and found that the most popular one had been closed last year.

My stripped-down entry file (app.js) looks like this:

As for other environment and version info:

  • Node.js: v15.14.0
  • Nodemon: 2.0.7
  • Express: 4.17.1
  • OS: Ubuntu 20.04.2 LTS on Windows 10 (WSL 2)

Right now, I’m forced to manually kill the running process myself and restart the Node server, which defeats the purpose of using Nodemon at all. Any help is appreciated.

I’ve found a temporary work-around, the steps for which are listed below:

  1. Install the NPM kill-port package as a development dependency: npm install -D kill-port
  2. Create a new file in your project’s root directory called nodemon.json and paste in the following JSON (edit the port numbers below from 3000 to whatever port you’re using for your Node.js app):
  1. Add the following NPM script to your package.json file (if you haven’t already):

All credit goes to Tudor Constantin on Stack Overflow. However, it is a bit tedious and definitely a workaround, not something that should be done for all future Node.js projects.

Correction: The method I’ve shown above provides inconsistent results, and shouldn’t be considered a fix. It only works half of the time, and also occasionally crashes when Nodemon restarts.

Back to the drawing board.

I came across variants of this issue many times without ever being able to replicate it deterministically. But on all cases, I have found that.

  • Killing the port-process $ on the nodemon events start , restart or crash , does not solve my problem.
  • Synchronously killing it right before calling .listen(. ) on my express app does not solve my problem.
  • However, asynchronously killing it before calling .listen(. ) in a .then() does solve my problem, when.
    • . either fuser -k $/tcp and npx kill-port $ is used to kill the port-process.
    • . the nodemon restart is delayed (hint: to delay it, merge your current nodemon.json with > ). I have the solution below running almost all of the times with .

I have written a brief code snippet that does the job of killing the conflicting port-process at run-time, using fuser . I don’t think adapting the code so as to use npx kill-port $ would be very hard: I would appreciate if anyone could augment my code with that adaptation 🙂

Basically, one call of killPort keeps killing all the port-processes that hold onto the port $ until no processes are left. Finally, an interval is set so that if a round of killPort has killed any process, it checks again after some time. This killing and re-killing was done because for some reason the conflicting port-processes would get killed once but the error EADDRINUSE would still show up. It may be overkill, pun intended, but to be honest, it works, and I’m happy because of that.

Here it is, along with my current use case and its output:

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