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    <p>Alternatives to GSON exists:</p> <ul> <li><a href="https://stackoverflow.com/questions/443499/json-to-map">Convert Json to Map</a></li> <li><a href="http://code.google.com/p/google-gson/issues/detail?id=45" rel="nofollow noreferrer">http://code.google.com/p/google-gson/issues/detail?id=45</a>.</li> </ul> <p>This snippet may help to do a <strong>generic</strong> decoder:</p> <pre><code>Map&lt; String, Object &gt; decoded = gson.fromJson(data, new TypeToken&lt; Map&lt; String, Object&gt;&gt;() {}.getType()); </code></pre> <p>The following code is a beginning of a <strong>specific</strong> decoder:</p> <pre><code>import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.URL; import com.google.gson.Gson; public class Test_Application { public static void main( String[] args ) throws Exception { Gson gson = new Gson(); String json = readUrl( "http://api.wunderground.com/api/57dd9039b81a9c21/" + "conditions/q/CA/San_Francisco.json" ); System.out.println( json ); Map&lt; String, Object &gt; decoded = gson.fromJson( json, new TypeToken&lt; Map&lt; String, Object&gt;&gt;() {}.getType()); System.out.println( decoded ); Answer answer = gson.fromJson( json, Answer.class ); System.out.println( answer.response.version ); System.out.println( answer.response.termsofService ); System.out.println( answer.response.features.get( "conditions" )); System.out.println( answer.current_observation.image ); System.out.println( answer.current_observation.display_location ); } static class Response { String version; URL termsofService; Map&lt; String, String &gt; features; } static class Observation { Map&lt; String, String &gt; image; Map&lt; String, String &gt; display_location; // TODO: complete me } static class Location { // TODO: complete me } static class Answer { Response response; Observation current_observation; Location display_location; // TODO: complete me } </code></pre> <p>At this state of development, it returns:</p> <pre><code>{response={version=0.1, termsofService=http://www.wunderground.com/weather/api/d/terms.html, features={conditions=1.0}}, current_observation={image={url=http://icons-ak.wxug.com/graphics/wu2/logo_130x80.png, title=Weather Underground, link=http://www.wunderground.com}, display_location={full=San Francisco, CA, city=San Francisco, state=CA, state_name=California, country=US, country_iso3166=US, zip=94101, latitude=37.77500916, longitude=-122.41825867, elevation=47.00000000}, observation_location={full=SOMA - Near Van Ness, San Francisco, California, city=SOMA - Near Van Ness, San Francisco, state=California, country=US, country_iso3166=US, latitude=37.773285, longitude=-122.417725, elevation=49 ft}, estimated={}, station_id=KCASANFR58, observation_time=Last Updated on February 19, 8:16 AM PST, observation_time_rfc822=Tue, 19 Feb 2013 08:16:18 -0800, observation_epoch=1361290578, local_time_rfc822=Tue, 19 Feb 2013 08:16:18 -0800, local_epoch=1361290578, local_tz_short=PST, local_tz_long=America/Los_Angeles, local_tz_offset=-0800, weather=Mostly Cloudy, temperature_string=48.7 F (9.3 C), temp_f=48.7, temp_c=9.3, relative_humidity=83%, wind_string=From the ESE at 1.0 MPH, wind_dir=ESE, wind_degrees=109.0, wind_mph=1.0, wind_gust_mph=0.0, wind_kph=1.6, wind_gust_kph=0.0, pressure_mb=1012, pressure_in=29.88, pressure_trend=-, dewpoint_string=44 F (7 C), dewpoint_f=44.0, dewpoint_c=7.0, heat_index_string=NA, heat_index_f=NA, heat_index_c=NA, windchill_string=49 F (9 C), windchill_f=49, windchill_c=9, feelslike_string=49 F (9 C), feelslike_f=49, feelslike_c=9, visibility_mi=10.0, visibility_km=16.1, solarradiation=, UV=0, precip_1hr_string=0.00 in ( 0 mm), precip_1hr_in=0.00, precip_1hr_metric= 0, precip_today_string=0.02 in (1 mm), precip_today_in=0.02, precip_today_metric=1, icon=mostlycloudy, icon_url=http://icons-ak.wxug.com/i/c/k/mostlycloudy.gif, forecast_url=http://www.wunderground.com/US/CA/San_Francisco.html, history_url=http://www.wunderground.com/weatherstation/WXDailyHistory.asp?ID=KCASANFR58, ob_url=http://www.wunderground.com/cgi-bin/findweather/getForecast?query=37.773285,-122.417725}} 0.1 http://www.wunderground.com/weather/api/d/terms.html 1 {url=http://icons-ak.wxug.com/graphics/wu2/logo_130x80.png, title=Weather Underground, link=http://www.wunderground.com} {full=San Francisco, CA, city=San Francisco, state=CA, state_name=California, country=US, country_iso3166=US, zip=94101, latitude=37.77500916, longitude=-122.41825867, elevation=47.00000000} </code></pre>
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    1. COonce I fill in the classes you have specified, I should be able to access the data right?
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    2. COJust as an FYI (And I only know this from other WU JSON questions) `features` in `Response` can actually contain a bunch of things which is why in my `Response` it's a `Map`. I don't know the full list of possibilities; you could also flesh out a complete `Features` object if there's a list in the API docs of all of them.
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    3. COYes, but it's painful, if you want just use fields, a generic Map< String, Object > with a custom made parser may be useful.
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