How do i run this npm script in the package.json? (concurrently) while my clien and server folders have their own directories

Question

While trying to do the MERN tutorial(Travers Media), i've also been asking a few questions to my friends who do code. And it irritates my friend that i don't separate client folder and server folder. but since my plan is to run both backend and frontend at the same time with concurrently, it hasn't actually been working.

"scripts": {
    "start": "node server.js",
    "server": "nodemon server.js",
    "client": "npm start  --suffix --prefix client",
    "dev": "concurrently \"npm run server\" && \"npm run client\""

  },

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Answer 1

concurrently doesn't seem to use && and no idea what --suffix --prefix client is supposed to do. Did you mean to start the server twice?

In any case getting rid of the && and adding an extra -- to the "client" script works for me

package.json

{
  "name": "test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "node server.js",
    "server": "nodemon server.js",
    "client": "npm start --  --suffix --prefix client",
    "dev": "concurrently \"npm run server\" \"npm run client\""
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "concurrently": "^5.3.0",
    "nodemon": "^2.0.4"
  }
}

server.js

const msg = process.argv[process.argv.length - 1] === 'client' ? 'client' : 'server';
console.log(process.argv.join(' '));
setInterval(() => {
  console.log(msg);
}, 2000);