This www folder is deployed to netlify as a static nextjs website.
In addition to that, we have functions/json-server/fn.js which is a serverless fn for serving data sources - it's compiled/packed with esbuild into a single file located at functions/json-server/json-server.js. For compiling this, run npm run build-functions (or npm run watch-functions) script found in www/package.json
For actually running the serverless function in browser, go in root and run npm run serve:functions (defined in /package.json) and then navigate to http://localhost:9999/.netlify/functions/json-server/employees