Currently we are limited to localhost , lan , or tunnel for where we want to host our locally served web app. I'd like to be able to customize the host to an entry in my /etc/hosts file. This allows us to have a more secure infra by not allowing localhost to hit our backend APIs, and allowing for a specified host that's not public to hit our backend. Features like this are currently supported in vite and webpack . It seems like metro supports this, but the start script for expo throws an error if we don't use localhost , lan, or tunnel Please reach out if you have any questions, or have a quick workaround. This is crucial for us to develop locally on web Thanks in advance