Start script missing error when running npm start

It looks like you might not have defined a start script in your package.json file or your project does not contain a server.js file.

If there is a server.js file in the root of your package, then npm will default the start command to node server.js.

https://docs.npmjs.com/misc/scripts#default-values

You could either change the name of your application script to server.js or add the following to your package.json

"scripts": {
    "start": "node your-script.js"
}

Or ... you could just run node your-script.js directly

I had this issue while installing react-js for the first time : These line helped me solve the issue:

npm rm -g create-react-app
npm install -g create-react-app
npx create-react-app my-app

source: https://stackoverflow.com/a/59260128/11652661

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