Examples | ArduinoJson 6

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Here are the 10 official examples of ArduinoJson. They are available in the "Examples" menu of the Arduino IDE.

deserializeJson(doc, input); const char* sensor = doc["sensor"]; long time = doc["time"]; double latitude = doc["data"][0]; double longitude = doc["data"][1];

JSON Parser

This example shows how to deserialize a JSON document with ArduinoJson.

View example

examples/JsonParserExample.ino

StaticJsonDocument<200> doc; doc["sensor"] = "gps"; doc["time"] = 1351824120; serializeJson(doc, Serial);

JSON Generator

This example shows how to generate a JSON document with the ArduinoJson library.

View example

examples/JsonGeneratorExample.ino

deserializeMsgPack(doc, input); const char* sensor = doc["sensor"]; long time = doc["time"]; double latitude = doc["data"][0]; double longitude = doc["data"][1];

MessagePack parser

This example shows how to parse a MessagePack input with ArduinoJson.

View example

examples/MsgPackParser.ino

client.println("GET /example.json HTTP/1.0"); client.println("Connection: close"); client.println(); client.find(endOfHeaders); deserializeJson(doc, client);

JSON HTTP Client

This example shows how to parse a JSON document in an HTTP response. It uses the Ethernet library, but can be easily adapted for Wifi.

View example

examples/JsonHttpClient.ino

udp.beginPacket(remoteIp, remotePort); serializeJson(doc, udp); udp.println(); udp.endPacket();

JSON UDP Beacon

This example shows how to send a JSON document to a UDP socket. It uses the Ethernet library but could easily be changed to support Wifi.

View example

examples/JsonUdpBeacon.ino

client.println("HTTP/1.0 200 OK"); client.println("Content-Type: application/json"); client.println(); serializeJsonPretty(doc, client); client.stop();

JSON HTTP Server

This example shows how to implement an HTTP server that sends JSON document in the responses.

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examples/JsonServer.ino

File file = SD.open(filename); deserializeJson(doc, file); file.close(); config.port = doc["port"] | 2731;

JSON Configuration File

This example shows how to store your project configuration in a file. It uses the SD library but can be easily modified for any other file-system.

View example

examples/JsonConfigFile.ino

long time = obj[String("time")]; obj[String("time")] = time; String sensor = obj["sensor"]; sensor = obj["sensor"].as<String>();

String objects and ArduinoJson

This example shows the different ways you can use String objects with ArduinoJson.

View example

examples/StringExample.ino

long time = obj[F("time")]; obj[F("time")] = time; obj["sensor"] = F("gps"); obj["sensor"] = serialized(F("\"gps\""));

Flash strings and ArduinoJson

This example shows the different ways you can use Flash strings (PROGMEM) with ArduinoJson.

View example

examples/ProgmemExample.ino

StaticJsonDocument<200> filter; filter["list"][0]["dt"] = true; filter["list"][0]["main"]["temp"] = true; deserializeJson(doc, input, DO::Filter(filter));

Filtering

This example shows how to filter a large input to keep only the relevant fields.

View example

examples/JsonFilterExample.ino

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