React js isn't running my app on localhost:3000

Question

hi all i used to work on MERN project for sometime but now my react app wont run on localhost:3000. So far i tried the following

1. Updated node.js/ reinstalled node.js
2. create new app using npx create-react-app but still localhost:3000 isn't working

I checked if port is opened or not using netstat -aon but localhost:3000 wasn't there. But 0.0.0.0:3000 is there. So my attempt to run telnet 127.0.0.1 3000 was not successful.

Am using windows 10 OS and latest version of nodejs

Answer 1

create .env file at the root of your project and add this line:

PORT = 3000

Then npm start again

Answer 2

Try the solution from this topic.

In package.json edit next string from this

"start": "react-scripts start"

to this

"start": "set PORT=3000 && react-scripts start"