In the Backend folder, create an .env file with the following content:

JWT_SECRET=<jwt-secret>
MONGO_URL=<database-connection-string>

In the Frontend folder, create an .env file with the following content:

REACT_APP_BACKEND_URL=<backend-url>

In the Backend folder, run the following commands:

node index.js

In the Frontend folder, run the following commands:

npm start