Go to frontend and backend directory to install packages
cd frontend
npm install
cd backend
npm install
Create .env file inside backend directory and copy the following code
MONGO_URI=Your mongodb URI
GMAIL_USERNAME=your gmail address
GMAIL_PASSWORD=password created inside 'App Password' section under google accounts setting
PORT=8000
JWT_SECRET=a random secret key
FRONTEND_URL=http://localhost:3000
Go to backend and frontend directory and start the server
cd backend
nodemon server
cd frontend
npm start