how to release localhost from Error listen EADDRINUSE

Question

i am testing a server written in nodejs on windows 7 and when i try to run the tester in the command line i get the following error  Error  listen EADDRINUSE at errnoException  net js 614 11  at Array 0  net js 704 26  at EventEmitter  tickCallback  node js 192 40    how can I fix it without rebooting

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To anyone who has tried all of the above  but still can t find the rouge process  try them all again but make sure you include  sudo  in front of the commands

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suppose your server is running on port 3000   lsof -i tcp 3000     COMMAND   PID USER   FD   TYPE DEVICE SIZE OFF NODE NAME     node    11716 arun   11u  IPv6 159175      0t0  TCP   3000  LISTEN    after that use kill -9  lt pid gt   in the above case sudo kill -9 11716

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I have node red installed on my Mac and my Raspberry Pi  Had the exact same problem and doing  killall  didn t help  Once I shut down the Raspberry Pi and restarted my computer it  worked fine

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When you get an error Error  listen EADDRINUSE   Try running the following shell commands   netstat -a -o   grep 8080 taskkill  F  PID 6204   I greped for 8080  because I know my server is running on port 8080   static tells me when I start it   serving     at http   127 0 0 1 8080    You might have to search for a different port

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In window  please execute this command    taskkill  F  PID 1952

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You are getting the error EADDRINUSE because the port  which your application wants to use  is occupied by another process  To release this port  you need to terminate the occupying process   Since you are on Windows  you can terminate the process using the command prompt  cmd   With the cmd you can discover the process ID  PID  of the blocking application  You will need the PID in order to terminate   kill the process   Here is a step-by-step guide      Find all processes which are running on a specified port  in this example  Port is  3000        netstat -ano   find   3000    The netstat command will list up all processes running on the specified port  In the last column of the netstat results you can see the PIDs  in this example  PID is  8308    You can find out more about a specific PID by running the following command      tasklist  fi  pid eq 8308   If you want to terminate a process  you can do that with the following command by using its PID  in this example  PID is  8308        taskkill  pid 8308  f    Screenshot

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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

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You will need to kill the port by trying to use the following command on the terminal    sudo killall -9 nodejs

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On Linux  Ubuntu derivatives at least   killall node   is easier than this form   ps   grep  lt something gt  kill  lt somepid gt    Neither will work if you have a orphaned child holding the port  Instead  do this   netstat -punta   grep  lt port gt    If the port is being held you ll see something like this   tcp           0      0 0 0 0  lt port gt           0 0 0         LISTEN      lt pid gt   lt parent gt    Now kill by pid   kill -9  lt pid gt

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I have solved this issue by adding below in my package json for killing active PORT - 4000  in my case  Running on WSL2 Linux Mac  quot scripts quot          quot dev quot    quot nodemon app js quot        quot predev quot   quot fuser -k 4000 tcp  amp  amp  echo  Terminated     echo  Nothing was running on the PORT  quot        Source

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It means the address you are trying to bind the server to is in use  Try another port or close the program using that port

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simply kill the node as  pkill -9 node in terminal of ubantu  than start node

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If you like UI more  find the process Node js in windows task manager and kill it

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To kill node server first run this command in your terminal      top open another window then copy the server id from the previous window  PID number -9 kill so now you killed your node server try again to run your app

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Run   ps -ax   grep node   You ll get something like   60778            0 00 62  usr local bin node abc js   Then do   kill -9 60778

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When you get an error     Error  listen EADDRINUSE   Open command prompt and type the following instructions   netstat -a -o   grep 8080 taskkill  F  PID    lt  ur Process ID no  gt    after that restart phone gap interface   If you want to know which process ID phonegap is using  open TASK MANAGER and look at the Column heading PID and find the PID no

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I used the command netstat -ano   grep  portnumber  in order to list out the port number PID for that process   Then  you can use taskkill -f   pid 111111 to kill the process  last value being the pid you find from the first command   One problem I run into at times is node respawning even after killing the process  so I have to use the good old task manager to manually kill the node process

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It may be possible that you have tried to run the npm start command in two different tabs  you cant run npm start when it is already running in some tab check it once

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The following command will give you a list of node processes running    ps   grep node   To free up that port  stop the process using the following   kill  lt processId gt

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Check the Process ID  sudo lsof -i 8081  Than kill the particular Process  sudo kill -9 2925

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This works on Mac   Step 1    sudo lsof -i tcp 3000  or whatever port you want to kill    Above command will give you the Process Id s  currently holding the port   Step 2    Kill -9  lt pid gt

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ps -ef  grep node find app js   kill pid of app js

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SOLVED   It s might be too late but it s working like a charm   You need pm2 to be installed  npm install -g pm2   To stoping the current running server  server js    pm2 stop -f server js

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Error  listen EADDRINUSE to solve it in Ubuntu run in terminal netstat -nptl  and after this kill -9  process-number  this command is to kill node process and now you can  try to run again node server js command  Ex   listen EADDRINUSE    8080  netstat -nptl   tcp6       0      0    9000                                         LISTEN      9660 java tcp6       0      0    5800                                         LISTEN      - tcp6       0      0    5900                                         LISTEN      - tcp6       0      0    8080                                         LISTEN      10401 node tcp6       0      0    20080                                        LISTEN      9660 java tcp6       0      0    80                                           LISTEN      - tcp6       0      0    22                                           LISTEN      - tcp6       0      0    10137                                        LISTEN      9660 java     kill -9 10401

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One possible solution that worked for me was simply to close the window in browser where I had the corresponding  http   localhost 3000   script running

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you can change your port in app js or in ur project configuration file    default  port   80   and to see if port 80 is already in use you can do   netstat -antp  grep 80  netstat -antp  grep node  you might wanna see if node process is already running or not    ps -ef  grep node  and if you find its already running  you can kill it using  killall node

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I created 2 servers  listening on same port 8081  running from same code  while learning  1st server creation shud have worked 2nd server creation failed with EADDRINUSE  node js callback delays might be reason behind neither worked  or 2nd server creation had exception  and program exited  so 1st server is also closed  2 server issue hint  I got from   How to fix Error  listen EADDRINUSE while using nodejs

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use below command to kill a process running at a certain port - 3000 in this example below   kill -9   lsof -t -i 3000

[node.js] how to release localhost from Error: listen EADDRINUSE

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