Why npm start is throwing events.js:187 throw er; // Unhandled 'error' event in my react project?

Question

While starting the server for the first time just after the code checkout , my react js project is throwing error \"events.js:187 throw er; // Unhandled \'error\'

Answer 1

Make sure all the global & local packages that are being used in the scripts are installed, I've spent hours debugging an issue while deploying an application because webpack-cli & yarn wasn't installed globally & my project was trying to access it locally.

Answer 2

You can use node Your_File_Name.js command to run from the localhost. To use npm start command, you need to use scripts array in your package.json file "scripts": { "start": "http://localhost:3000/" } If this is not helpful can you attach more details?

Answer 3

Try this if none of the above answers solved u.. Go to My Computer>Properties>Advanced and in the environment variables Edit the PATH and add the following

C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem; C:\Program Files\nodejs;C:\Users{yourName}\AppData\Roaming\npm

Add 4 of them and restart your PC

Answer 4

In your package.json file try lowering the version of "react-scripts" to "2.1.8":

"dependencies": { 
    "@testing-library/jest-dom": "^4.2.4",  
    "@testing-library/react": "^9.4.0",  
    "@testing-library/user-event": "^7.2.1",  
    "react": "^16.12.0",  
    "react-dom": "^16.12.0",  
    "react-scripts": "2.1.8"  
  },  

Above works for me.

Answer 5

If you are experiencing this error on ubuntu simply prepend "sudo" to the npm start command. That is sudo npm start

Answer 6

Downgrading the react-script version from 3.0.1 to 2.1.8 worked for me. Follow the following commands in sequence:- npm install react-scripts@2.1.8 npm install npm start