How can i run NPM Commands in VSCode terminal?

i'm working on NPM terminal in VSCode as git and i installed an extension to support NPM but didn’t work and i just got that error

'npm' is not recognized as an internal or external command,operable program or batch file.

EDIT

i already installed node.js , i just want to work in the regular command prompt rather than node.js cmd and i got errors but it worked well when i open cmd as an admin after adding 'C:\Program Files\nodejs' to the path. now how i work with npm in cmd without opening it as an admin ? i think it’s a permissions issue tho.