score:0

edit 2

your app should start by running yarn run-tutorial or npm run run-tutorial judging by the package.json file its using yarn as its package manager but should work with npm just fine. if it doesnt, install yarn here https://classic.yarnpkg.com/en/docs/install

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edit 1

as a side note though, if you downloaded the app off the internet it may not run using npm start thats just a generic command to start apps. if you include the contents of the entire package.json file it will list out the different commands available to start the app or perform other tasks

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original answer

your package.json file will need to be opened and add the following code:

{
  // ...
  "scripts": {
     "start": "node app.js"
  }
}

if you have named your javascript file something different than app.js it will be whatever you have named your root file


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