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Veda Johnson
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Asked: 2022-05-18T15:46:22+00:00 In:

How to avoid the error “throw er; // unhandled ‘error’ event”?

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For the problem “throw er; // unhandled ‘error’ event.” I tried to fix it, but It doesn’t work and returns the result I want. Here is my program:

express -e folderName
 npm install ejs --save
 npm install

and

events.js:72
  throw er; // Unhandled 'error' event
  ^
 Error: listen EADDRINUSE
  at errnoException (net.js:884:11)
  at Server._listen2 (net.js:1022:14)
  at listen (net.js:1044:10)
  at Server.listen (net.js:1110:5)
  at Object.<anonymous> (folderName/app.js:33:24)
  at Module._compile (module.js:456:26)
  at Object.Module._extensions..js (module.js:474:10)
  at Module.load (module.js:356:32)
  at Function.Module._load (module.js:312:12)
  at Function.Module.runMain (module.js:497:10)

has occurred. I’ve checked the entire command line but still can’t find the mistake.

unhandled 'error' event
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2 Answers

  1. Best Answer
    Expert

    The cause: You have another server running on the same port, such as 8080. And this error happens perhaps because you had run node app in other shell, please close it and try again.

    The solution: check PORT no. is available or not by using

    grep port no> | netstat -tulnp

    You can also use the command lsof:

    lsof -i :<port no>
    • 5

  2. Sometimes, we get the same error when running our express app. In that instance, we need to do the same. It is necessary to verify that it is running on any terminal. These steps will help you find and kill the process.

    • ps aux | grep node
    • Locate the process ID (second from left):
    • Kill -9 PRCOCESS_ID


    OR

    To close all running node processes, use one command 

    ps aux | awk '/node/{print $2}' | xargs kill -9
    • 7

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