interface Deno.ListenOptions

The port to listen on.

Set to 0 to listen on any available port.

A literal IP address or host name that can be resolved to an IP address.

Note about 0.0.0.0 While listening 0.0.0.0 works on all platforms, the browsers on Windows don't work with the address 0.0.0.0. You should show the message like server running on localhost:8080 instead of server running on 0.0.0.0:8080 if your program supports Windows.

Maximum number of pending connections in the listen queue.

This parameter controls how many incoming connections can be queued by the operating system while waiting for the application to accept them. If more connections arrive when the queue is full, they will be refused.

The kernel may adjust this value (e.g., rounding up to the next power of 2 plus 1). Different operating systems have different maximum limits.