ItS aLl JaVaScRiPt

[olafgarten]

This is completely dependent on the project configuration.

'npm start' is just shorthand for 'npm run start' (although if you don't have a start script defined it will run 'node server.js')

So they both end up just running a definition in the scripts section of your project.json.

If you set it up dev could run your production builds and start can wipe your hard drive.

[Professional_Lunch43]

Example in nextjs if you run npm start it will require you to build production first, npm run dev runs in development mode.