Nothing but error messages

[latesha-carter]

I have been trying to create a web page using create react app and I managed to get to npm start however the localhost 3000 cannot open. it fails every time. I'm not sure what I am doing wrong. It also will not process npm install -g create-react-app. I've been working on this for 4 hours and on the verge of tears! HELP

[MrRob0t404]

Hey! What kind of errors are you getting?

[Suhansa-code]

Hey! did you guys solved it .

[Subham11258]

You can check for whether the port 3000 is in use.

Windows
open powersehell and run netstat -ano | findstr :3000 and note the PID. Then close it from task manager.
Linux/Mac
Run lsof -i :3000 and terminate any processes using that port with kill -9

Run the React app on another port if Port 3000 is problematic

Windows
set PORT=3001 && npm start
Linux/Mac
PORT=3001 npm start

Try clearing npm cache files to resolve issue

For both Windows and Linux/Mac
npm cache clean --force

[iwashitahga]

I have this issue too.

npm start seems to be successful on localhost:3000 because it doesn't occur any error message and it shows App running at ~ localhost:3000 ~. However, I cannot open localhost:3000, and there is no application working on port 3000.

Using another port, 4000, solve the problem, but it is I think just a temporary measure. What is a fundamental solution ?