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

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

node.jsreactjs


Solution 1:[1]

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

PORT = 3000

Then npm start again

Solution 2:[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"

Solution 3:[3]

Finally i found the solution i did installed a package htt-proxy-middleware which actually bugged some files in react, still not sure. but simply you can get back to work by deleting your package-lock.json and entering npm i to reinstall all the packages. It worked for me. I hope it will solve the problem for other developers too.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 carrany
Solution 2 aopanasenko
Solution 3 Wasal Rasool

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