尝试启动Express应用程序时出现奇怪的node.js错误

Question

I can start my app using nodemon, just by typing nodemon

but got below error when I do node app.js

My package.json is configured properly. It has

"scripts": { "start": "node ./bin/www" }

Answer 1

EADDRINUSE means that a port your node application attempted to bind to, has already been bound to by another process. Typically this suggests you haven't killed your last node process before starting the current one, or you haven't configured your application to use the correct port (eg, a system port that can't be bound to, or a port below 1024 which requires administrative access to bind to).

Answer 2

there is something in use, try to restart your machine and try again. =D

Answer 3

The port is already in use, there might be another instance of your application already running. To see what processes are running background use netstat -tlpn and to filter node only processes netstat -tlpn | grep node netstat -tlpn | grep node .

tcp        0      0 127.0.0.1:8081          0.0.0.0:*               LISTEN      22917/node          
tcp        0      0 127.0.0.1:8666          0.0.0.0:*               LISTEN      358/node            
tcp        0      0 127.0.0.1:8667          0.0.0.0:*               LISTEN      4416/node  

As you see the port 8081 is already taken, try to kill it and start you server again kill 22917 .