To install all the dependencies, run npm install in the project root. You might also need to install npx globally to be able to run the scripts, you can do it by running npm install -g npx.

Afterwards you can start the application by running npm start. This will start the application server and will also output the URL where you can reach it. By default, this is http://localhost:3000. The start NPM script runs nodemon behind the scenes, so your changes to the application will be picked up and the server application will be restarted automatically to contain your latest modifications.