Downloading and Parsing JSON

grab-json-data.js

// node.js
// use the built in http library
var http = require("http");

// start a GET request for the URL
http.get("http://marsweather.ingenology.com/v1/latest/",
  function(result) {
   // when the request is ready, start downloading the data in chunks
   var data = "";
   
   result.on("data", function (chunk) {
                // when a chunk of data arrives, add it to the data string
                data += chunk.toString();
              });
   
   result.on("end", function () {
                // when there are no more chunks of data, parse the json and print it out
                var json = JSON.parse(data);
                console.log(json.report.sunrise);
              });
 });

json.pde

// processing

// declare a variable to store the json
JSONObject json;

void setup() {
  size(800, 800);
  // request the json data from the URL, loading it as json in the same step
  json = loadJSONObject("http://marsweather.ingenology.com/v1/latest/?format=json");
  // extract a value from the json data
  float pressure = json.getJSONObject("report").getFloat("pressure");
  // use the value to draw to the screen
  ellipse(500.0, 500.0, pressure, pressure);
}