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bcrypt is a library to used hashed password

cloudinary similar as aws -> file leti hai or server pe dal deti h hum kya krnge user se file upload krwaynge or ye multer se file upload hogi, cloudinary is a service only

use multer -> user se file lenge or ussy ek temp-file localstorage me rkh lenge.fir cloudinary ka use krke uss localstorage se file server pe dal denge.ye production level pe aise hi kaam hota h temp-file me dalna hi prta h direct multer se cloudinary pe ni dal skte