The JSON web service allows you to directly program your back-end JSON scripts to deliver dynamic geo-localized pages using the JSON variables provided by geoPlugin.

To access this service, add the following url to a remote include call

http://www.geoplugin.net/json.gp?ip=xx.xx.xx.xx

Of course, substitute the xx's with your visitor's IP number.

Example output of a JSON query for your IP address (38.107.191.113) is:

geoPlugin({
	
  "geoplugin_city":"",
	
  "geoplugin_region":"",
	
  "geoplugin_areaCode":"0",
	
  "geoplugin_dmaCode":"0",
	
  "geoplugin_countryCode":"US",
	
  "geoplugin_countryName":"United States",
	
  "geoplugin_continentCode":"NA",
	
  "geoplugin_latitude":"38",
	
  "geoplugin_longitude":"-97",
	
  "geoplugin_regionCode":"",
	
  "geoplugin_regionName":null,
  "geoplugin_currencyCode":"USD",
	
  "geoplugin_currencySymbol":"$",
	
  "geoplugin_currencyConverter":1

})

The variable “geoplugin_currencyConverter” is the conversion rate for the currency converter base currency.
Like all calls to any of geoPlugin's web services, the default base_currency is USD ($US).
Thus, if your base currency is NOT $US, then you must add the variable base_currency=XXX to the call to geoplugin.net eg

http://www.geoplugin.net/json.gp?base_currency=EUR

Now geoplugin_currencyConverter will output the exchange rate of one Euro for your visitor.

If you are using jQuery for example to do AJAX calls to the JSON webservice, you will probably be seeing the Javascript error Error: Invalid label
To eliminate this error, tag jsoncallback=? onto the url when making the jQuery Ajax call to any JSON webservice
eg

 
$.getJSON("http://www.geoplugin.net/json.gp?jsoncallback=?",
function (data) {
	for (var i in data) {
		document.write('data["i"] = ' + i + '<br/>');
	}
);

Here is a working, extremely simple example of how to use the JSON service.
Here, we create a live AJAX currency converter, with little more than a few lines of HTML.

 
<script src="http://www.google.com/jsapi"></script>
<script src="http://www.geoplugin.net/javascript.gp" type="text/javascript"></script>
<script src="http://www.geoplugin.net/ajax_currency_converter.gp"></script>
Convert 
<input type='text' id='gp_amount' size='4' /> 
<select id="gp_from"></select> 
to 
<select id="gp_to"></select>
<p><input type='button' onClick='gp_convertIt()' value = 'Convert It' /></p>
<script>gp_currencySymbols()</script>
 
<div id="gp_converted"></div>
 

which will output:

Convert to

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1. Quickstart User Guide
2. In-depth User Guide
   1. About geoPlugin
   2. To register or not register?
   3. geoPlugin web services
      • Javascript
      • PHP
      • JSON
      • XML
      • ASP
      • geoPlugin currency conversion
      • geoPlugin webservice Extras
        • Latitude/Longitude to Place
        • Nearby Places
        • Latitude/Longitude to Postal Code
   4. geoPlugin Web Analytics
      • Adding Domains
      • Activating Domains
      • Statistics Tracking Code
      • ClickHeat map Technology
3. Some real-world examples
   
4. Discussion Group