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Alejandro Guerrero 2026-09-27 17:21:39 +02:00
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libraries/ESP_Async_WebServer/examples/Json/Json.ino Normal file
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// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright 2016-2025 Hristo Gochkov, Mathieu Carbou, Emil Muratov
//
// Shows how to send and receive Json data
//
#include <Arduino.h>
#if defined(ESP32) || defined(LIBRETINY)
#include <AsyncTCP.h>
#include <WiFi.h>
#elif defined(ESP8266)
#include <ESP8266WiFi.h>
#include <ESPAsyncTCP.h>
#elif defined(TARGET_RP2040) || defined(TARGET_RP2350) || defined(PICO_RP2040) || defined(PICO_RP2350)
#include <RPAsyncTCP.h>
#include <WiFi.h>
#endif
#include <ESPAsyncWebServer.h>
static AsyncWebServer server(80);
#if ASYNC_JSON_SUPPORT == 1
static AsyncCallbackJsonWebHandler *handler = new AsyncCallbackJsonWebHandler("/json2");
#endif
void setup() {
Serial.begin(115200);
#if SOC_WIFI_SUPPORTED || CONFIG_ESP_WIFI_REMOTE_ENABLED || LT_ARD_HAS_WIFI || CONFIG_ESP32_WIFI_ENABLED
WiFi.mode(WIFI_AP);
WiFi.softAP("esp-captive");
#endif
#if ASYNC_JSON_SUPPORT == 1
//
// sends JSON using AsyncJsonResponse
//
// curl -v http://192.168.4.1/json1
//
server.on("/json1", HTTP_GET, [](AsyncWebServerRequest *request) {
AsyncJsonResponse *response = new AsyncJsonResponse();
JsonObject root = response->getRoot().to<JsonObject>();
root["hello"] = "world";
response->setLength();
request->send(response);
});
// Send JSON using AsyncResponseStream
//
// curl -v http://192.168.4.1/json2
//
server.on("/json2", HTTP_GET, [](AsyncWebServerRequest *request) {
AsyncResponseStream *response = request->beginResponseStream("application/json");
JsonDocument doc;
JsonObject root = doc.to<JsonObject>();
root["foo"] = "bar";
serializeJson(root, *response);
Serial.println();
request->send(response);
});
// curl -v -X POST -H 'Content-Type: application/json' -d '{"name":"You"}' http://192.168.4.1/json2
// curl -v -X PUT -H 'Content-Type: application/json' -d '{"name":"You"}' http://192.168.4.1/json2
//
// edge cases:
//
// curl -v -X POST -H "Content-Type: application/json" -d "1234" -H "Content-Length: 5" http://192.168.4.1/json2 => rx timeout
// curl -v -X POST -H "Content-Type: application/json" -d "1234" -H "Content-Length: 2" http://192.168.4.1/json2 => 12
// curl -v -X POST -H "Content-Type: application/json" -d "1234" -H "Content-Length: 4" http://192.168.4.1/json2 => 1234
// curl -v -X POST -H "Content-Type: application/json" -d "1234" -H "Content-Length: 10" http://192.168.4.1/json2 => rx timeout
// curl -v -X POST -H "Content-Type: application/json" -d "12345678" -H "Content-Length: 8" http://192.168.4.1/json2 => 12345678
// curl -v -X POST -H "Content-Type: application/json" -d "123456789" -H "Content-Length: 8" http://192.168.4.1/json2 => 12345678
// curl -v -X POST -H "Content-Type: application/json" -d "123456789" -H "Content-Length: 9" http://192.168.4.1/json2 => 413: Content length exceeds maximum allowed
handler->setMaxContentLength(8);
handler->setMethod(HTTP_POST | HTTP_PUT);
handler->onRequest([](AsyncWebServerRequest *request, JsonVariant &json) {
serializeJson(json, Serial);
Serial.println();
AsyncJsonResponse *response = new AsyncJsonResponse();
JsonObject root = response->getRoot().to<JsonObject>();
root["hello"] = json.as<JsonObject>()["name"];
response->setLength();
request->send(response);
});
server.addHandler(handler);
// New Json API since 3.8.2, which works for both Json and MessagePack bodies
// curl -v -X POST -H 'Content-Type: application/json' -d '{"name":"You"}' http://192.168.4.1/json3
server.on("/json3", HTTP_POST, [](AsyncWebServerRequest *request, JsonVariant &json) {
Serial.printf("Body request : ");
serializeJson(json, Serial);
Serial.println();
AsyncJsonResponse *response = new AsyncJsonResponse();
JsonObject root = response->getRoot().to<JsonObject>();
root["hello"] = json.as<JsonObject>()["name"];
response->setLength();
request->send(response);
});
#endif
server.begin();
}
// not needed
void loop() {
delay(100);
}