React Tinder Clone Setup Server Side setup cd server npm i npm run dev You need to add your own port and mongodb atlas address to the .env file .env PORT= Your Port Number ATLAS_URL= "Your Atlas Url " SECRET_KEY = "jwt SecretKey" Client part setup cd client npm i npm start You need to add your own api url to the .env file .env REACT_APP_API_URL="Your Api Url" Screenshots