When building Phoenix LiveView applications, you may occasionally need to access the client’s IP address. LiveView does not expose this by default, but Phoenix provides a straightforward way to include it in the connection metadata and read it inside your LiveView.

Add :peer_data to your socket configuration

In your endpoint.ex, enable :peer_data inside the connect_info for the LiveView socket:

socket "/live", Phoenix.LiveView.Socket,
  websocket: [connect_info: [:peer_data, session: @session_options]],
  longpoll: [connect_info: [session: @session_options]]

This makes the remote IP address available to your LiveView process.

Read :peer_data inside the mount/3 function

Inside your LiveView module, you can fetch the connect info using get_connect_info/2:

peer_data = get_connect_info(socket, :peer_data)

This returns a map containing connection metadata, including the address field.

Extract the IP address

The address is a tuple such as {192, 168, 1, 10}. Convert it to a string:

ip = Enum.join(Tuple.to_list(peer_data.address), ".")

You can now store this IP in assigns or log it for monitoring and analytics.

Summary

By enabling :peer_data on the socket and reading it via get_connect_info/2, you can reliably access the client’s IP address inside any LiveView. This is useful for auditing, rate limiting, session tracking, and security-related features.