Bookmarklet that calls a REST API to fetch geolocation details for a given IP address

IPLookup.js

//IP LOCATION TRACKER BOOKMARKLET
//Original source: https://funbutlearn.com/2016/06/ip-location-tracker-bookmarklet-created.html
//modified API service from http://ip-api.com which doesn't support HTTPS to https://ipapi.co/ to have a secure endpoint & avoid Mixed Content blocking issue
javascript: (function() {
    var text = "";
    if (window.getSelection) {
        text = window.getSelection().toString();
    } else if (document.selection && document.selection.type != "Control") {
        text = document.selection.createRange().text;
    }
    var ipPattern = new RegExp("^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$");
    var res = ipPattern.test(text);
    if (res) {
        showIP(text);
    } else {
        var ip = prompt("Please provide an IP address");
        showIP(ip);
    }

    function showIP(ipAddr) {
        var xhttp = new XMLHttpRequest();
        xhttp.onreadystatechange = function() {
            if (xhttp.readyState == 4 && xhttp.status == 200) {
                var ipDetails = JSON.parse(xhttp.responseText);
                var ipAddr = "";
                for (key in ipDetails) {
                    ipAddr += key.toUpperCase() + " : " + ipDetails[key] + "\n";
                }
                alert(ipAddr);
            }
        };
        xhttp.open("GET", "https://ipapi.co/" + ipAddr + "/json/", true);
        xhttp.send();
    }
})()

iplookup.min.js

javascript:(function(){var e="";if(window.getSelection){e=window.getSelection().toString()}else{if(document.selection&&document.selection.type!="Control"){e=document.selection.createRange().text}}var a=new RegExp("^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]).){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$");var b=a.test(e);if(b){c(e)}else{var d=prompt("Please provide an IP address");c(d)}function c(f){var g=new XMLHttpRequest();g.onreadystatechange=function(){if(g.readyState==4&&g.status==200){var i=JSON.parse(g.responseText);var h="";for(key in i){h+=key.toUpperCase()+" : "+i[key]+"\n"}alert(h)}};g.open("GET","https://ipapi.co/"+f+"/json/",true);g.send()}})();