ArduinoJson/examples/JsonGeneratorExample/JsonGeneratorExample.ino

// ArduinoJson - https://arduinojson.org
// Copyright © 2014-2025, Benoit BLANCHON
// MIT License
//
// This example shows how to generate a JSON document with ArduinoJson.
//
// https://arduinojson.org/v7/example/generator/

#include <ArduinoJson.h>

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

  // Allocate the JSON document
  JsonDocument doc;

  // Add values in the document
  doc["sensor"] = "gps";
  doc["time"] = 1351824120;

  // Add an array
  JsonArray data = doc["data"].to<JsonArray>();
  data.add(48.756080);
  data.add(2.302038);

  // Generate the minified JSON and send it to the Serial port
  serializeJson(doc, Serial);
  // The above line prints:
  // {"sensor":"gps","time":1351824120,"data":[48.756080,2.302038]}

  // Start a new line
  Serial.println();

  // Generate the prettified JSON and send it to the Serial port
  serializeJsonPretty(doc, Serial);
  // The above line prints:
  // {
  //   "sensor": "gps",
  //   "time": 1351824120,
  //   "data": [
  //     48.756080,
  //     2.302038
  //   ]
  // }
}

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

// See also
// --------
//
// https://arduinojson.org/ contains the documentation for all the functions
// used above. It also includes an FAQ that will help you solve any
// serialization problem.
//
// The book "Mastering ArduinoJson" contains a tutorial on serialization.
// It begins with a simple example, like the one above, and then adds more
// features like serializing directly to a file or an HTTP request.
// Learn more at https://arduinojson.org/book/
// Use the coupon code TWENTY for a 20% discount ❤❤❤❤❤