Don't use localhost:3000, use your own custom domain

Using localhost with port numbers for local development is messy when juggling multiple projects. By editing the system hosts file (/etc/hosts on Linux/macOS) to map custom domain names to 127.0.0.1, and configuring Nginx as a reverse proxy to forward traffic to the correct port, developers can use clean URLs like dev.myproject.com locally. This approach makes multi-project environments easier to manage and demos look more professional. A WSL2-specific note covers using the virtual IP instead of 127.0.0.1.