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// SPDX-License-Identifier: LGPL-3.0-or-later
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// Copyright 2016-2026 Hristo Gochkov, Mathieu Carbou, Emil Muratov, Will Miles
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//
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// Shows how to send and receive Json data
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//
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#include <Arduino.h>
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#if defined(ESP32) || defined(LIBRETINY)
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#include <AsyncTCP.h>
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#include <WiFi.h>
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#elif defined(ESP8266)
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#include <ESP8266WiFi.h>
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#include <ESPAsyncTCP.h>
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#elif defined(TARGET_RP2040) || defined(TARGET_RP2350) || defined(PICO_RP2040) || defined(PICO_RP2350)
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#include <RPAsyncTCP.h>
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#include <WiFi.h>
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#endif
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#include <ESPAsyncWebServer.h>
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static AsyncWebServer server(80);
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#if ASYNC_JSON_SUPPORT == 1
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static AsyncCallbackJsonWebHandler *handler = new AsyncCallbackJsonWebHandler("/json2");
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#endif
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void setup() {
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Serial.begin(115200);
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#if ASYNCWEBSERVER_WIFI_SUPPORTED
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WiFi.mode(WIFI_AP);
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WiFi.softAP("esp-captive");
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#endif
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#if ASYNC_JSON_SUPPORT == 1
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//
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// sends JSON using AsyncJsonResponse
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//
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// curl -v http://192.168.4.1/json1
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//
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server.on("/json1", HTTP_GET, [](AsyncWebServerRequest *request) {
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AsyncJsonResponse *response = new AsyncJsonResponse();
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JsonObject root = response->getRoot().to<JsonObject>();
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root["hello"] = "world";
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response->setLength();
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request->send(response);
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});
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// Send JSON using AsyncResponseStream
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//
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// curl -v http://192.168.4.1/json2
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//
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server.on("/json2", HTTP_GET, [](AsyncWebServerRequest *request) {
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AsyncResponseStream *response = request->beginResponseStream("application/json");
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JsonDocument doc;
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JsonObject root = doc.to<JsonObject>();
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root["foo"] = "bar";
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// serializeJson(root, Serial);
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// Serial.println();
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request->send(response);
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});
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// curl -v -X POST -H 'Content-Type: application/json' -d '{"name":"You"}' http://192.168.4.1/json2
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// curl -v -X PUT -H 'Content-Type: application/json' -d '{"name":"You"}' http://192.168.4.1/json2
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//
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// edge cases:
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//
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// curl -v -X POST -H "Content-Type: application/json" -d "1234" -H "Content-Length: 5" http://192.168.4.1/json2 => rx timeout
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// curl -v -X POST -H "Content-Type: application/json" -d "1234" -H "Content-Length: 2" http://192.168.4.1/json2 => 12
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// curl -v -X POST -H "Content-Type: application/json" -d "1234" -H "Content-Length: 4" http://192.168.4.1/json2 => 1234
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// curl -v -X POST -H "Content-Type: application/json" -d "1234" -H "Content-Length: 10" http://192.168.4.1/json2 => rx timeout
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// curl -v -X POST -H "Content-Type: application/json" -d "12345678" -H "Content-Length: 8" http://192.168.4.1/json2 => 12345678
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// curl -v -X POST -H "Content-Type: application/json" -d "123456789" -H "Content-Length: 8" http://192.168.4.1/json2 => 12345678
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// 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
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handler->setMaxContentLength(8);
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handler->setMethod(HTTP_POST | HTTP_PUT);
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handler->onRequest([](AsyncWebServerRequest *request, JsonVariant &json) {
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serializeJson(json, Serial);
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Serial.println();
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AsyncJsonResponse *response = new AsyncJsonResponse();
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JsonObject root = response->getRoot().to<JsonObject>();
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root["hello"] = json.as<JsonObject>()["name"];
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response->setLength();
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request->send(response);
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});
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server.addHandler(handler);
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// New Json API since 3.8.2, which works for both Json and MessagePack bodies
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// curl -v -X POST -H 'Content-Type: application/json' -d '{"name":"You"}' http://192.168.4.1/json3
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server.on("/json3", HTTP_POST, [](AsyncWebServerRequest *request, JsonVariant &json) {
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Serial.printf("Body request : ");
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serializeJson(json, Serial);
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Serial.println();
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AsyncJsonResponse *response = new AsyncJsonResponse();
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JsonObject root = response->getRoot().to<JsonObject>();
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root["hello"] = json.as<JsonObject>()["name"];
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response->setLength();
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request->send(response);
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});
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#endif
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server.begin();
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}
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static uint32_t lastHeapTime = 0;
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static uint32_t lastHeap = 0;
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void loop() {
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#ifdef ESP32
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uint32_t now = millis();
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if (now - lastHeapTime >= 500) {
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uint32_t heap = ESP.getFreeHeap();
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if (heap != lastHeap) {
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lastHeap = heap;
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async_ws_log_w("Free heap: %" PRIu32, heap);
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}
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lastHeapTime = now;
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}
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#endif
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}
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