You will need to have Node and npm installed locally on your machine.
Clone this repo. From the "server" repository of the project, run npm install. You can then run the server with npm start. The server should run on localhost with default port 3000. If the server runs on another port for any reason, this is printed to the console when the server starts, e.g. Listening on port 3000.
Clone groupomania-client repo. From the repository of the project, run npm install. Use npm run dev to access this on localhost:5173.