404 not found error while using AJAX and Node.js

I'm looking to gather JSON data from the Open Weather Map API but have been running into trouble.

First, while running it using "file:///" I received a "Cross origin requests are only supported for protocol schemes..." error. Previous answers suggested running on a local server so I spun up a local node server and ran it again but received a "Get http://8080/404/url 404 not found" error.

Fairly new to all of this so any suggestions would be greatly appreciated.

var $url = "api.openweathermap.org/data/2.5/weather?";
$url += $.param({
  "q": "London",
  "units": "imperial",
  "appid": "6cbde47ec63b876312c74a78055a5481",
  "format": "json",
  "callback": "?"
});

$.ajax({
url: $url,
dataType: "jsonp",
  success: function(data) {
    console.log("Working");
}
});

via pxr13