ExpressJS - throw er Unhandled error event

Question

I created expressjs application using the following commands:

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

When I run the appli

Answer 1

Reason for this error

Some other process is already running on the port you have specified

Simple and Quick solution

On Linux OS, For example you have specified 3000 as the port

• Open the terminal and run lsof -i :3000. If any process is already running on port 3000 then you will see this printing on the console

COMMAND   PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
node    16615 aegon   13u  IPv6 183768      0t0  TCP *:3000 (LISTEN)

• Copy the PID (process ID) from the output

• Run sudo kill -9 16615 (you have to put PID after -9)

• Start the server again