We’ve been trying to get our BloomSky data parsed and reflected in OpenHAB — we can automatically turn the lights on when there is motion *and* the luminescence is lower than some desired value. Bloomsky has an API which allows us to retrieve JSON formatted data from our weather station. I never worked with JSON before – I’d heard the term, but didn’t actually know what it was … but I needed to parse it in a JavaScript transform. Does JavaScript do JSON? D’oh! Turns out JSON is an abbreviation for JavaScript Object Notation, and JavaScript parses JSON data really well.
Still need to turn my example web code into a transform that runs from OpenHAB, but getting values out of a JSON formatted string is as easy as using the “parse” function:
<html>
<head>
<script>
function parseMyData() {
var input = '{"DeviceID":"83237E","LAT":41.226644299999997,"LON":-81.7224322,"ALT":292.78720092773438,"UTC":-4,"DST":1,"Searchable":true,"RegisterTime":1464494138,"CityName":"Hinckley","StreetName":"Bellus Road","FullAddress":"Bellus Road, Hinckley, Ohio, US","DeviceName":"Buzzard Cam 01","BoundedPoint":null,"NumOfFollowers":5,"Data":{"Temperature":80.528000000000006,"ImageURL":"http://storage.googleapis.com/bloomsky-img/eaB1rJytnZSmm5y3qJ1krJqwmJmtoJU=.jpg","Humidity":50,"Night":false,"ImageTS":1465938980,"Luminance":3445,"TS":1465938980,"Rain":false,"Pressure":29.087148500000001,"Voltage":2613,"UVIndex":"1"},"Point":{},"VideoList":["http://storage.googleapis.com/bloomsky-video/eaB1rJytnZSmm5y3_-4_2016-06-09.mp4","http://storage.googleapis.com/bloomsky-video/eaB1rJytnZSmm5y3_-4_2016-06-10.mp4","http://storage.googleapis.com/bloomsky-video/eaB1rJytnZSmm5y3_-4_2016-06-11.mp4","http://storage.googleapis.com/bloomsky-video/eaB1rJytnZSmm5y3_-4_2016-06-12.mp4","http://storage.googleapis.com/bloomsky-video/eaB1rJytnZSmm5y3_-4_2016-06-13.mp4"],"NumOfFavorites":0}'
var jsonOfInput = JSON.parse(input);
document.write("<P>Device ID is: " + jsonOfInput.DeviceID + "</P>");
document.write("<P>Temp is: " + jsonOfInput.Data.Temperature + "</P>");
document.write("<P>Luminance is: " + jsonOfInput.Data.Luminance + "</P>");
}
</script>
</head>
<body>
<h2>Press the button to start</h2>
<input type="button" onclick="parseMyData()" value="Parse"/>
</body>
</html>