JsonParserExample.ino

Description

This example shows how to deserialize the following JSON document with ArduinoJson.

{
  "sensor": "gps",
  "time": 1351824120,
  "data": [
    48.756080,
    2.302038
  ]
}

An online demo of this example is available on wandbox.org.

Source code

#include <ArduinoJson.h>

void setup() {
  // Initialize serial port
  Serial.begin(9600);
  while (!Serial)
    continue;

  // Allocate the JSON document
  JsonDocument doc;

  // JSON input string.
  const char* json = "{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";

  // Deserialize the JSON document
  DeserializationError error = deserializeJson(doc, json);

  // Test if parsing succeeds.
  if (error) {
    Serial.print(F("deserializeJson() failed: "));
    Serial.println(error.f_str());
    return;
  }

  // Fetch values.
  //
  // Most of the time, you can rely on the implicit casts.
  // In other case, you can do doc["time"].as<long>();
  const char* sensor = doc["sensor"];
  long time = doc["time"];
  double latitude = doc["data"][0];
  double longitude = doc["data"][1];

  // Print values.
  Serial.println(sensor);
  Serial.println(time);
  Serial.println(latitude, 6);
  Serial.println(longitude, 6);
}

void loop() {
  // not used in this example
}

This program prints the following output:

gps
1351824120
48.756080
2.302038

Things used in this example

Classes

Functions

Libraries

See also