#include <ArduinoJson.h>

//Both datatypes work below
String my_array = "[1,2,3,4,5,6,7,8,9,0]";
//const char my_array[40] = "[1,2,3,4,5,6,7,8,9,0]";

int my_int_array[10];

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  // compute the required size
  const size_t CAPACITY = JSON_ARRAY_SIZE(10);

  // allocate the memory for the document
  StaticJsonDocument<CAPACITY> doc;

  // parse a JSON array
  deserializeJson(doc, my_array);

  // extract the values
  JsonArray array = doc.as<JsonArray>();
  /*
  for(JsonVariant v : array) {
      Serial.println(v.as<int>());
  }
  */
  int i = 0;
  
  for(JsonVariant v : array) {
      my_int_array[i] = v.as<int>();
      i++;
  }
}

void loop() {
  for(int j = 0; j < 10; j++) {
    Serial.println(my_int_array[j]);
    delay(1000); // this speeds up the simulation
  }
}