In the project directory, you can run: Before starting the project Create a env.local file in the directory backend with the 4 environment variables DB_USER DB_PASSWORD DB_PORT DB_NAME DB_HOST TOKEN_TTL JWT_PRIVATE_KEY go mod tidy to install relevant dependency in air to start the backend project npm i in both frontend and root directory npm run dev to start frontend server concurrently "npm run dev --prefix frontend" "air" to run both at the same time