SPIFFS/LittleFS: Read/Write JSON

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#include <FS.h>

#include <SPIFFS.h>

#include <ArduinoJson.h>

void setup() {
  Serial.begin(115200);
  SPIFFS.begin(true);
  DynamicJsonDocument doc(256);
  doc["ssid"] = "MyWiFi";
  doc["pw"] = "secret";
  File f = SPIFFS.open("/cfg.json", "w");
  serializeJson(doc, f);
  f.close();
}
void loop() {}