HOW TO Track the Location of a User via JavaScript

ipapi is an IP Location API that can fetch the location of a user - their city, country, Latitude / Longitude based on the IP address it detects from the browser making the function call. It can also get the Time Zone, Calling Code, Currency among other things. 

Here's a minimal JavaScript code sample showing Geolocation with IPAPI API -

Also see - Public APIs you can use