Error: listen EADDRINUSE: address already in use :::3000?

Question

Node.js

This error appeared.
Earlier, as a protection, I found such a hack, insert into the package.json script

"predev": "fuser -k 3000/tcp && echo 'Terminated' || echo 'Nothing was running on the 3000'",

Now it doesn't work either.

I found the second option, add the following code to server/index.js, the start file for the server

async function start() {
  process.once("SIGUSR2", function () {
    process.kill(process.pid, "SIGUSR2");
  });
  const nuxt = await loadNuxt(isDev ? "dev" : "start");
  app.use(nuxt.render);
  if (isDev) {
    build(nuxt);
  }
  app.listen(PORT);
}

// Запуск приложения.
start();

process.once, I found this recommendation on the site npm nodemon.

And anyway, if I change the code in the server files, then an error appears.

Answer 1

The decision came by itself.
If you make any changes to the files on the server again 10 seconds after the error occurs, the error will disappear.

Answer 2

The problem is solved by stopping pm2 before changing the code. pm2 stop 0 command.