I type npm run dev in the terminal but my project on visual studio code doesn't run

I want to run my program but it doesn't work. why?

 npm run devnpm ERR! Missing script: "dev"npm ERR! npm ERR! To see a list of scripts, run:npm ERR!   npm runnpm ERR! A complete log of this run can be found in:npm ERR!     C:\Users\melih\AppData\Local\npm-cache\_logs\2024-01-30T13_29_39_378Z-debug-0.logPS C:\Users\melih\Desktop\EF\interactive playground> npm run

I typed in npm run dev but it did not run.