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libraries/Arduino_JSON/examples/JSONObject/JSONObject.ino

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+/*
+  JSON Object
+
+  This sketch demonstrates how to use various features
+  of the Official Arduino_JSON library, in particular for JSON objects.
+
+  This example code is in the public domain.
+*/
+
+#include <Arduino_JSON.h>
+#include <assert.h>
+
+const char input[] = "{\"result\":true,\"count\":42,\"foo\":\"bar\"}";
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial);
+
+  demoParse();
+
+  demoCreation();
+}
+
+void loop() {
+}
+
+void demoParse() {
+  Serial.println("parse");
+  Serial.println("=====");
+
+  JSONVar myObject = JSON.parse(input);
+
+  // JSON.typeof(jsonVar) can be used to get the type of the variable
+  if (JSON.typeof(myObject) == "undefined") {
+    Serial.println("Parsing input failed!");
+    return;
+  }
+
+  Serial.print("JSON.typeof(myObject) = ");
+  Serial.println(JSON.typeof(myObject)); // prints: object
+
+  // myObject.hasOwnProperty(key) checks if the object contains an entry for key
+  if (myObject.hasOwnProperty("result")) {
+    Serial.print("myObject[\"result\"] = ");
+
+    Serial.println((bool) myObject["result"]);
+  }
+
+  if (myObject.hasOwnProperty("count")) {
+    Serial.print("myObject[\"count\"] = ");
+
+    Serial.println((int) myObject["count"]);
+  }
+
+  if (myObject.hasOwnProperty("count")) {
+    Serial.print("myObject[\"count\"] = ");
+
+    Serial.println((double) myObject["count"]);
+  }
+
+  if (myObject.hasOwnProperty("foo")) {
+    Serial.print("myObject[\"foo\"] = ");
+
+    Serial.println((const char*) myObject["foo"]);
+  }
+
+  // JSONVars can be printed using print or println
+  Serial.print("myObject = ");
+  Serial.println(myObject);
+
+  Serial.println();
+}
+
+void demoCreation() {
+  Serial.println("creation");
+  Serial.println("========");
+
+  JSONVar myObject;
+
+  myObject["hello"] = "world";
+  myObject["true"] = true;
+
+  myObject["x1"] = (int) 42;
+  myObject["x2"] = (long) 42;
+  myObject["x3"] = (unsigned long) 42;
+
+  int x1 = myObject["x1"];
+  assert(x1 == 42);
+  
+  long x2 = myObject["x2"];
+  assert(x2 == 42);
+
+  unsigned long x3 = myObject["x3"];
+  assert(x3 == 42);
+
+  Serial.print("myObject.keys() = ");
+  Serial.println(myObject.keys());
+
+  // JSON.stringify(myVar) can be used to convert the JSONVar to a String
+  String jsonString = JSON.stringify(myObject);
+
+  Serial.print("JSON.stringify(myObject) = ");
+  Serial.println(jsonString);
+
+  Serial.println();
+
+  // myObject.keys() can be used to get an array of all the keys in the object
+  JSONVar keys = myObject.keys();
+
+  for (int i = 0; i < keys.length(); i++) {
+    JSONVar value = myObject[keys[i]];
+
+    Serial.print("JSON.typeof(myObject[");
+    Serial.print(keys[i]);
+    Serial.print("]) = ");
+    Serial.println(JSON.typeof(value));
+
+    Serial.print("myObject[");
+    Serial.print(keys[i]);
+    Serial.print("] = ");
+    Serial.println(value);
+
+    Serial.println();
+  }
+
+  Serial.println();
+
+  // setting a value to undefined can remove it from the object
+  myObject["x"] = undefined;
+
+  // you can also change a value
+  myObject["hello"] = "there!";
+
+  Serial.print("myObject = ");
+  Serial.println(myObject);
+}