This is a trivial client-server application created to demonstrate how such a setup looks using ExpressJS for the server and Vite for the frontend.
The server exposes a /color endpoint that generates a random color. This
endpoint optionally accepts a variant parameter that constains the color
space. The color is returned as a JSON object with red, green, and blue
integer values. The client invokes the server-side endpoint on load and when the
user clicks the Change Color button.
This is done using the Vite-Express module. See that project's README for a description of how this works under the hood.
The project containerized with Docker. To run the docker container:
docker build .
docker run -p 3000:3000 <container-id>