bblanchon / arduinojson

📟 JSON library for Arduino and embedded C++. Simple and efficient.

---

ArduinoJson is a C++ JSON library for Arduino and IoT (Internet Of Things).

Features

• JSON deserialization
  • Optionally decodes UTF-16 escape sequences to UTF-8
  • Optionally supports comments in the input
  • Optionally filters the input to keep only desired values
  • Supports single quotes as a string delimiter
  • Compatible with NDJSON and JSON Lines
• JSON serialization
  • Can write to a buffer or a stream
  • Optionally indents the document (prettified JSON)
• MessagePack serialization
• MessagePack deserialization
• Efficient
  • Twice smaller than the "official" Arduino_JSON library
  • Almost 10% faster than the "official" Arduino_JSON library
  • Consumes roughly 10% less RAM than the "official" Arduino_JSON library
  • Deduplicates strings
• Versatile
  • Supports custom allocators (to use external RAM chip, for example)
  • Supports String, std::string, and std::string_view
  • Supports Stream and std::istream/std::ostream
  • Supports Flash strings
  • Supports custom readers and custom writers
  • Supports custom converters
• Portable
  • Usable on any C++ project (not limited to Arduino)
  • Compatible with C++11, C++14 and C++17
  • Support for C++98/C++03 available on ArduinoJson 6.20.x
  • Zero warnings with -Wall -Wextra -pedantic and /W4
  • Header-only library
  • Works with virtually any board
    • Arduino boards: Uno, Due, Micro, Nano, Mega, Yun, Leonardo...
    • Espressif chips: ESP8266, ESP32
    • Lolin (WeMos) boards: D1 mini, D1 Mini Pro...
    • Teensy boards: 4.0, 3.2, 2.0
    • Particle boards: Argon, Boron, Electron, Photon...
    • Texas Instruments boards: MSP430...
    • Soft cores: Nios II...
  • Tested on all major development environments
    • Arduino IDE
    • Atmel Studio
    • Atollic TrueSTUDIO
    • Energia
    • IAR Embedded Workbench
    • Keil uVision
    • MPLAB X IDE
    • Particle
    • PlatformIO
    • Sloeber plugin for Eclipse
    • Visual Micro
    • Visual Studio
  • Even works with online compilers like wandbox.org
  • CMake friendly
• Well designed
  • Elegant API
  • Thread-safe
  • Self-contained (no external dependency)
  • const friendly
  • for friendly
  • TMP friendly
  • Handles integer overflows
• Well tested
  • Unit test coverage close to 100%
  • Continuously tested on
    • Visual Studio 2017, 2019, 2022
    • GCC 4.8, 5, 6, 7, 8, 9, 10, 11, 12
    • Clang 3.9, 4.0, 5.0, 6.0, 7, 8, 9, 10, 11, 12, 13, 14, 15
  • Continuously fuzzed with Google OSS Fuzz
  • Passes all default checks of clang-tidy
• Well documented
  • Tutorials
  • Examples
  • How-tos
  • FAQ
  • Troubleshooter
  • Book
  • Changelog
• Vibrant user community
  • Most popular of all Arduino libraries on GitHub
  • Used in hundreds of projects
  • Responsive support

Quickstart

Deserialization

Here is a program that parses a JSON document with ArduinoJson.

const char* json = "{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";

JsonDocument doc;
deserializeJson(doc, json);

const char* sensor = doc["sensor"];
long time          = doc["time"];
double latitude    = doc["data"][0];
double longitude   = doc["data"][1];

See the tutorial on arduinojson.org

Serialization

Here is a program that generates a JSON document with ArduinoJson:

JsonDocument doc;

doc["sensor"] = "gps";
doc["time"]   = 1351824120;
doc["data"][0] = 48.756080;
doc["data"][1] = 2.302038;

serializeJson(doc, Serial);
// This prints:
// {"sensor":"gps","time":1351824120,"data":[48.756080,2.302038]}

See the tutorial on arduinojson.org

Sponsors

ArduinoJson is thankful to its sponsors. Please give them a visit; they deserve it!

If you run a commercial project that embeds ArduinoJson, think about sponsoring the library's development: it ensures the code that your products rely on stays actively maintained. It can also give your project some exposure to the makers' community.

If you are an individual user and want to support the development (or give a sign of appreciation), consider purchasing the book Mastering ArduinoJson ❤, or simply cast a star ⭐.

arduinojson's Issues

I2C + ArduinoJson

Hi,

Great Plugin, but i need to send the Json package via I2c and before it i want to copy in a buffer of 32Bytes, Do you have some idea of how use your library for that?

thanks

Add support for C99 types

Hi again,

At the moment, the library only supports a single non-portable unsigned type (long) and double.

long time          = root["time"];
jsonObject["time" = (long)time;   // If time is a uint32_t

Would it be possible to add support for C99 types (e.g. uint8_t, uint16_t, uint32_t, int8_t and float etc.) for accessing and setting JSON values? This would get rid of a lot of unnecessary casts in codebases that use C99 types like ours.

uint32_t time          = root["time"];
jsonObject["time"]  = time;

Thanks!

Unable to run example using Arduino IDE

I installed the ArduinoJson dir into the arduino library and ran the example code and they did not run. Complained about the path. I noticed that the structure is different than other Arduino Libraries. Can you shed some light on this. The documentation on install is not clear.

Thanks in advance

Thanks for a great library!!!

I've been watching you consistently develop this library over the past six months, and I used it today for a publish and subscribe architecture designed to help hobbyists move into more advanced robotics. Your library allowed me to implement remote subscription in order to facilitate multi-processor robots.

ArduinoJson saved me a week's worth of time!!

Thank you,
Zac
@zacsketches

Escaped strings in JSON

Hello again,

Say if we were to parse JSON that looked like this -

{
    "message": "\"Hello there\""
}

When we read it out like so -

JsonObject root = parser->parse( json );
const char *message = root["message"];
// Shouldn't we be getting the unescaped form here?

I noticed that we still get the escaped form. Perhaps this is a bug in Jsmn?

Non-strict parsing mode in the newest version?

You have written a great library, thank you so much! Your code in version 4 looks really clean, I am impressed. It seems that now the JSON parser only operates in what you were calling strict-mode in your previous version. Now if the JSON is not well formed it returns an error instead of parsing in a non-strict manor. Would you consider replacing the original non-strict parsing behavior? Perhaps that would ruin the cleanliness of your new code and it is not reasonable to expect a JSON parser to handle ill formed strings, but I did think it was really nice when your previous code gracefully accepted what now it simply rejects. Previously it seemed that strings inside the JSON did not necessarily need quotation marks, and tokens could be separated with spaces as well as commas. Perhaps even more was allowed through the old non-strict parser that other more strict parsers would reject. I am using your library to parse JSON that I type on a command line and your previous non-strict version saved me from having to type lots of characters that I now need to add. Perhaps I am being lazy and sloppy, but would you please consider restoring the old behavior, at least as an option?

Library issues with Galileo and Edison IDE from Intel.

The current version of the library ArduinoJson V4 is not visible on the MAC when used from the ARDUINO IDE used by Arduino Galileo and Arduino Edison, the IDE provided by INTEL Arduino 1.5.3-Intel 1.0.4 https://communities.intel.com/docs/DOC-23242
If we delete the file "libraries.properties" from the library, the IDE sees the library, however it has compile errors.
I had no problems when used on the MAC with Arduino IDE 1.5.6-r2
The implementation is really elegant indeed.
I am using it to parse the weather from openweathermap.org on the JSON format API.
Thanks.
AC/.

nested Array can not contain other arrays?

Hi,

I like to do something like

JsonArray& data = root.createNestedArray("data");

JsonArray& data1 = data.createNestedArray("data1");
data1.add(48.756080, 6);
data1.add(2.302038, 6);
JsonArray& data2 = data.createNestedArray("data2");
data2.add(48.756080, 6);
data2.add(2.302038, 6);

data.add(data1);
data.add(data2);

But get this compilation error
JsonGeneratorExample.ino:19:52: error: no matching function for call to 'ArduinoJson::JsonArray::createNestedArray(const char [6])'
JsonGeneratorExample.ino:19:52: note: candidate is:
In file included from /home/cccc/Arduino_sketchbook/libraries/ArduinoJson/include/ArduinoJson.h:8:0,
from /home/cccc/Arduino_sketchbook/libraries/ArduinoJson/ArduinoJson.h:11,
from JsonGeneratorExample.ino:7:
/home/cccc/Arduino_sketchbook/libraries/ArduinoJson/include/../include/ArduinoJson/JsonArray.hpp:68:14: note: ArduinoJson::JsonArray& ArduinoJson::JsonArray::createNestedArray()
JsonArray &createNestedArray();

My JSON string should look like this {"sensor":"gps","time":1351824120,"data":[[48.756080,2.302038],[48.756080,2.302038]]}

Isn't this possible or where is my error?

Best Christian

Another compiler error, this time on Apple (Snow Leopard)

variable name shadowing occurs :
In file included from /Users/oldenburgh/techniek/software/consoletest/../externals/software/extern/json/ArduinoJson/include/ArduinoJson.h:10, from /Users/oldenburgh/techniek/software/consoletest/toepassing/jsonTest.cpp:17: /Users/oldenburgh/techniek/software/consoletest/../externals/software/extern/json/ArduinoJson/include/../include/ArduinoJson/StaticJsonBuffer.hpp: In member function ‘virtual void* ArduinoJson::StaticJsonBuffer<CAPACITY>::alloc(size_t)’: /Users/oldenburgh/techniek/software/consoletest/../externals/software/extern/json/ArduinoJson/include/../include/ArduinoJson/StaticJsonBuffer.hpp:25: warning: declaration of ‘size’ shadows a member of 'this'

virtual destructor warning

When compiling for STM32 Cortex-M4 I got this warning 👎:

ArduinoJson/src/Internals/../../include/ArduinoJson/Internals/../JsonBuffer.hpp:21:7: error: 'class ArduinoJson::JsonBuffer' has virtual functions and accessible non-virtual destructor [-Werror=non-virtual-dtor] class JsonBuffer { ^ cc1plus: all warnings being treated as errors
I saw the comment about adding malloc() to Arduino code. This is quite true, but leaving a destructor not virtual with virtual functions is considered very sloppy programming.

😄 I propose you add #ifndef ARDUINO around the virtual destructor. On my STM32 those 500 bytes are of no concern and I would like to get rid of the compiler warning, which translates into an error in my build.

Get JSON String Length in Arduino

I want to send a JSON string via UDP from my Arduino. I was thinking to use this method (from the wiki):

char buffer[256];
array.printTo(buffer, sizeof(buffer));

I would prefer not to allocate such a large buffer. Is there a way to get the length of the string that will be generated so the buffer can be sized accordingly? Example code that could do with these improvements:

StaticJsonBuffer<200> jsonBuffer;

JsonObject& root = jsonBuffer.createObject();
root["sensor"] = "gps";
root["time"] = 1351824120;

JsonArray& data = root.createNestedArray("data");
data.add(48.756080, 6); // 6 is the number of decimals to print
data.add(2.302038, 6); // if not specified, 2 digits are printed

char buffer[256];
root.printTo(buffer, sizeof(buffer));

// send a reply, to the IP address and port that sent us the packet we received
Udp.beginPacket(remoteIP, port);
Udp.write(buffer, sizeof(buffer));
Udp.endPacket();

FreeBSD 10.0 compile error

Hi,

I got the following compile errors when compiling your new API on FreeBSD 10.0 (using clang) :

`Scanning dependencies of target ArduinoJSon
[ 76%] Building CXX object software/extern/json/CMakeFiles/ArduinoJSon.dir/ArduinoJson/src/Arduino/Print.cpp.o

[ 76%] Building CXX object software/extern/json/CMakeFiles/ArduinoJSon.dir/ArduinoJson/src/Internals/IndentedPrint.cpp.o

[ 77%] Building CXX object software/extern/json/CMakeFiles/ArduinoJSon.dir/ArduinoJson/src/Internals/JsonParser.cpp.o

[ 78%] Building CXX object software/extern/json/CMakeFiles/ArduinoJSon.dir/ArduinoJson/src/Internals/List.cpp.o

/opslag/home/oldenburgh/techniek/software/externals/software/extern/json/ArduinoJson/src/Internals/List.cpp:34:16: error: explicit instantiation of 'ArduinoJson::Internals::List' must occur in namespace 'Internals'
template class List;
^
/opslag/home/oldenburgh/techniek/software/externals/software/extern/json/ArduinoJson/src/Internals/../../include/ArduinoJson/Internals/List.hpp:21:7: note: explicit instantiation refers here
class List {
^
/opslag/home/oldenburgh/techniek/software/externals/software/extern/json/ArduinoJson/src/Internals/List.cpp:35:16: error: explicit instantiation of 'ArduinoJson::Internals::List' must occur in namespace 'Internals'
template class List;
^
/opslag/home/oldenburgh/techniek/software/externals/software/extern/json/ArduinoJson/src/Internals/../../include/ArduinoJson/Internals/List.hpp:21:7: note: explicit instantiation refers here
class List {
^
2 errors generated.
software/extern/json/CMakeFiles/ArduinoJSon.dir/build.make:123: recipe for target 'software/extern/json/CMakeFiles/ArduinoJSon.dir/ArduinoJson/src/Internals/List.cpp.o' failed`

Is this a bug, or a compile issue I have?

4.2 can't parse the jsonObject in jsonArray

#include <ArduinoJson.h>

void setup() {
  Serial.begin(9600);
  delay(2000);
  StaticJsonBuffer<200> jsonBuffer;

  char json[] =
      "{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[{\"a\":48.756080,\"b\":2.302038}]}";

  JsonObject& root = jsonBuffer.parseObject(json);

  if (!root.success()) {
    Serial.println("parseObject() failed");
    return;
  }

  const char* sensor = root["sensor"];
  long time = root["time"];
  JsonArray& array = root["data"];


  Serial.println(sensor);
  Serial.println(time);
  Serial.println(array.size());
}

void loop() {
  // not used in this example
}

array.size() is 0.
It seems parse fail,but no error occur.

Case sensitive JsonPaser/jsmn.h

Hi,

On linux, new library doesn't compile.
The file JsonParser.cpp search to include file #include "JsonParser/Jsmn.cpp" but this file is named "JsonParser/jsmn.cpp".
On windows it works because windows is not case sensitive but linux is it.

Best regards.

Invalid read when querying for a field that doesn't exist

Hi again,

I was writing some simple parsing tests and came across this error when I ran my test on Valgrind.

Given a test vector like this one -

static const char *jsonSimpleObject = R"*(
{
   "firstname": "first",
   "lastname": "last"
}
)*";

If I try to get a field that doesn't exist like so -

char *json = strclone( jsonSimpleObject );
JsonHashTable hashTable = parser.parseHashTable( json );

EXPECT_TRUE( hashTable.success() );
EXPECT_THAT( hashTable.getString( "firstname" ), StrEq( "first" ) );
EXPECT_THAT( hashTable.getString( "lastname" ), StrEq( "last" ) );
EXPECT_THAT( hashTable.getString( "middlename" ), Eq( nullptr ) );

The error reported by Valgrind is as below -

==16231== Conditional jump or move depends on uninitialised value(s)
==16231==    at 0x81983E5: JsonObjectBase::getNestedTokenCount(jsmntok_t*) (JsonObjectBase.cpp:18)
==16231==    by 0x8198253: JsonHashTable::getToken(char const*) (JsonHashTable.cpp:44)
==16231==    by 0x81983A5: JsonHashTable::getString(char const*) (JsonHashTable.cpp:83)
==16231==    by 0x80EF597: 

Can't fill JsonArray in for loop

(Disclaimer: I'm not at all an expert in C/C++)

I am trying to build a JsonArray in a for loop on an Arduino Mega 2560, iterating through an array. Here is a (somewhat) minimal example of what I'm trying to do.

struct Person {
    int id;
    char name[32];
};

Person boss;
boss.id = 1;
strcpy(boss.name, "Jeff");
Person employee;
employee.id = 2;
strcpy(employee.name, "John");

Person persons[2] = {boss, employee};

JsonArray<2> json;
for(int i = 0; i < 2; i++) {
    JsonObject<2> object;
    object.add("id", persons[i].id);
    object.add("name", persons[i].name);
    json.add(object);
}

Serial.print(json);

The expected result is:

[
    {
        id: 1,
        name: "Jeff"
    },
    {
        id: 2,
        name: "John"
    }
]

However, I get this:

[
    {
        id: 2,
        name: "John"
    },
    {
        id: 2,
        name: "John"
    }
]

Any idea why I can't construct an JsonArray this way?

List<JsonObject>

Hello, I am trying to create a list of JSONObject and then interact with the list.
But I found no documentation specific for this use, and to include the item in the list and then remove, could help me with this question?

Integrate with latest version of Jsmn

It looks like there have been breaking API changes in the latest version of Jsmn.

It'd be great to have this library integrated with the latest version.

compatibility with Baeyens Eclipse plugin

though the Arduino IDE itself works very well and great, using Eclipse with Baeyens Arduino Plugin seens to handle imports or paths different.

Would mind you check http://forum.arduino.cc/index.php?topic=263011.0 for further details?

thanks & cheers for this great lib

Compiling error under linux in Sublime text 2

Hi,

I get an error when I try to compile your example code (JsonParserExample.ino) in Sublime text 2 in Linux (Ubuntu 14.04.1). It compiles your code correctly in arduino ide without any errors however in Sublime text 2 I get the following errors, they are related to the tests:

Compiling JsonParserExample...
Creating /home/devicee/Arduino_Build/JsonParserExample/JsonParserExample.ino.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/malloc.c.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/realloc.c.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/CDC.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/HID.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/HardwareSerial.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/IPAddress.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/Print.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/Stream.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/Tone.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/USBCore.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/WInterrupts.c.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/WMath.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/WString.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/main.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/new.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/wiring.c.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/wiring_analog.c.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/wiring_digital.c.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/wiring_pulse.c.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/wiring_shift.c.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/EscapedString.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/IndentedPrint.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/JsonArrayBase.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/JsonObjectBase.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/JsonPrettyPrint.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/JsonPrintable.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/JsonValue.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/Print.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/StringBuilder.cpp.o...
Creating /home/devicee/Arduino_Build/JsonParserExample/EscapedStringTests.cpp.o...
/home/devicee/sketchbook/libraries/ArduinoJson-master/JsonGeneratorTests/EscapedStringTests.cpp:6:25: error: CppUnitTest.h: No such file or directory
/home/devicee/sketchbook/libraries/ArduinoJson-master/JsonGeneratorTests/EscapedStringTests.cpp:10: error: ‘Microsoft’ has not been declared
/home/devicee/sketchbook/libraries/ArduinoJson-master/JsonGeneratorTests/EscapedStringTests.cpp:10: error: ‘CppUnitTestFramework’ is not a namespace-name
/home/devicee/sketchbook/libraries/ArduinoJson-master/JsonGeneratorTests/EscapedStringTests.cpp:10: error: expected namespace-name before ‘;’ token
/home/devicee/sketchbook/libraries/ArduinoJson-master/JsonGeneratorTests/EscapedStringTests.cpp:15: error: expected constructor, destructor, or type conversion before ‘(’ token
/home/devicee/sketchbook/libraries/ArduinoJson-master/JsonGeneratorTests/EscapedStringTests.cpp:95: error: expected `}' at end of input
[Stino - Error 1]

Can you help me to solve this problem? Thank you very much for your support!

Merge parser and generator API

Hi again,

Is there an easy way to convert a Parser::JsonObject to Generator::JsonObject? I have a good reason to do this :)

compile without warning in gcc (-Wold-cast_style

When compiling in gcc with maximum warning level. it generate only warning:

warning: use of old-style cast [-Wold-style-cast]
      return (float)(_content.asDouble);

which can be easely fixed by using a static_cast instead:

--- a/JsonGenerator/JsonValue.h
+++ b/JsonGenerator/JsonValue.h
@@ -76,7 +76,7 @@ namespace ArduinoJson

             operator float()
             {
-                return (float)_content.asDouble;
+                return static_cast<float>(_content.asDouble);
             }

             operator int()

Compile issue with "char[] json"

Using the Arduino IDE 1.0.5, I can't compile the example because of the char[] json variable. It gives an error: expected unqualified-id before '[' token

If I replace it by char* json or char json[] it seems to work.

Shadow declaration issues

Hi,

when I instruct my compiler (clang++ on FreeBSD10) to be really picky (-Wall -Wpointer-arith -Wswitch -Wreturn-type -Wshadow -Wunused -Werror -Wundef -Wno-ctor-dtor-privacy -Woverloaded-virtual) I get these issues:

[ 79%] Building CXX object software/extern/json/CMakeFiles/ArduinoJSonGenerator.dir/ArduinoJson/JsonGenerator/JsonArrayBase.cpp.o In file included from /opslag/home/oldenburgh/techniek/software/externals/software/extern/json/ArduinoJson/JsonGenerator/JsonArrayBase.cpp:6: /opslag/home/oldenburgh/techniek/software/consoletest/../externals/software/extern/json/ArduinoJson/JsonGenerator/JsonArrayBase.h:18:38: error: declaration shadows a field of 'ArduinoJson::Generator::JsonArrayBase' [-Werror,-Wshadow] JsonArrayBase(JsonValue* items, int capacity) ^ /opslag/home/oldenburgh/techniek/software/consoletest/../externals/software/extern/json/ArduinoJson/JsonGenerator/JsonArrayBase.h:68:24: note: previous declaration is here JsonValue* items;

What is wrong that you call the constructor argument items a name that already exists in the class - this is considered sloppy C++ style 👎 and should be avoided.

Similar things happen here :

 [ 78%] Building CXX object software/extern/json/CMakeFiles/ArduinoJSonGenerator.dir/ArduinoJson/JsonGenerator/JsonObjectBase.cpp.o
In file included from /opslag/home/oldenburgh/techniek/software/externals/software/extern/json/ArduinoJson/JsonGenerator/JsonObjectBase.cpp:6:

/opslag/home/oldenburgh/techniek/software/consoletest/../externals/software/extern/json/ArduinoJson/JsonGenerator/JsonObjectBase.h:49:42: error: declaration shadows a field of 'ArduinoJson::Generator::JsonObjectBase' [-Werror,-Wshadow]
            JsonObjectBase(KeyValuePair* items, int capacity)
                                         ^
/opslag/home/oldenburgh/techniek/software/consoletest/../externals/software/extern/json/ArduinoJson/JsonGenerator/JsonObjectBase.h:55:27: note: previous declaration is here
            KeyValuePair* items;
                          ^
/opslag/home/oldenburgh/techniek/software/consoletest/../externals/software/extern/json/ArduinoJson/JsonGenerator/JsonObjectBase.h:49:53: error: declaration shadows a field of 'ArduinoJson::Generator::JsonObjectBase' [-Werror,-Wshadow]
            JsonObjectBase(KeyValuePair* items, int capacity)
                                                    ^
/opslag/home/oldenburgh/techniek/software/consoletest/../externals/software/extern/json/ArduinoJson/JsonGenerator/JsonObjectBase.h:56:17: note: previous declaration is here
            int capacity, count;

One could of course turn off the compiler setting "-Wshadow" but I don't think that is the way to go.
If you want to be really scrutinous, on gcc you can include -Weffc++ . This enforces Scott Meyer's "Effective C++ rules". I tried that once but the amount of warnings I got was enormous - so much for writing error-free C++ code !

Number of tokens

Hi,

how are the number of tokens calculated?

Following the example I got:

char json[] = "{"sensor":"gps","time":1351824120,"data":[48.756080,2.302038]}";

1 token = sensor
2 token = gps
3 token = time
4 token = 1351824120
5 token = data
6 token = [48.756080,2.302038] the array itself
7 token = 48.756080
8 token = 2.302038
9 token = the whole object

How do you get 12 tokens?

Indentation

Do you have a plan about indentation of printed/generated string?

Implement JSON encoding

I have just started using your library (great, easy-to-use library by the way!) and I was wondering if it would be possible to implement JSON encoding as well.

At the moment, we have to hand-code outbound JSON (which is slightly painful and error-prone).

Another virtual destructor issue cropping up

Hi,

The pragma you entered suppresses the virtual destructor warning in the static buffer declaration.

I have another issue, this time with the dynamic buffer, with not declaring the destructor virtual :
[ 94%] Building CXX object toepassing/usb/CMakeFiles/stm32f3demo.elf.dir/usb_bot.cpp.o In file in cluded from /Users/oldenburgh/techniek/Variosystem/software/boardtest/torenvalk/../../externals/software/extern/json/ArduinoJson/include/ArduinoJson.h:7:0, from /Users/oldenburgh/techniek/Variosystem/software/boardtest/torenvalk/toepassing/usb/h/usbdemo.h:22, from /Users/oldenburgh/techniek/Variosystem/software/boardtest/torenvalk/toepassing/usb/usb_bot.cpp:38: /Users/oldenburgh/techniek/Variosystem/software/boardtest/torenvalk/../../externals/software/extern/json/ArduinoJson/include/../include/ArduinoJson/DynamicJsonBuffer.hpp: In destructor 'ArduinoJson::DynamicJsonBuffer::~DynamicJsonBuffer()': /Users/oldenburgh/techniek/Variosystem/software/boardtest/torenvalk/../../externals/software/extern/json/ArduinoJson/include/../include/ArduinoJson/DynamicJsonBuffer.hpp:20:33: error: deleting object of polymorphic class type 'ArduinoJson::DynamicJsonBuffer' which has non-virtual destructor might cause undefined behaviour [-Werror=delete-non-virtual-dtor] ~DynamicJsonBuffer() { delete _next; } ^ cc1plus: all warnings being treated as errors

This time, it concerns the dynamic buffer constructor. I see no issue here to declare it virtual, since this class assumes using dynamic allocation anyway.
(The compiler warning shown here originates from arm-none-eabi-g++ 4.8.4 )

JsonArray output to string is wrong

JsonArray output to string is wrong when members are JsonObjects, i get two items (as i inserted 2), but both contain the values of the last added item

JsonObject<3> root; 
JsonArray<10> modules;
root.add("paramA", "1234");
root.add("paramB", 1234);
for(int i = 0; i < 2; ++i)
{
    JsonObject<3> obj;
    obj.add("SParam1", dataArr[i].p1);
        obj.add("SParam2", "");
        obj.add("SParam3", dataArr[i].p3);

    modules.add(obj);
}

root.add("modules", modules);
StringBuilder sbldr(postData, 4096);
sbldr.print(root);

4.0 and 4.1 wont verify in Arduino 1.0.5

I get this message after following your instructions, and trying to verify the JsonGeneratorExample:-

JsonGeneratorExample.ino: In function 'void setup()':
JsonGeneratorExample:12: error: 'StaticJsonBuffer' was not declared in this scope
JsonGeneratorExample:12: error: 'jsonBuffer' was not declared in this scope
JsonGeneratorExample:14: error: 'JsonObject' was not declared in this scope
JsonGeneratorExample:14: error: 'root' was not declared in this scope
JsonGeneratorExample:18: error: 'JsonArray' was not declared in this scope
JsonGeneratorExample:18: error: 'data' was not declared in this scope

Similar output for the other two example also.

Please advise.

The serialization results incorrect

I experience a wrong serialization by using such a snippet:

//
// Step 1: Reserve memory space
//
StaticJsonBuffer<200> jsonBuffer;

//
// Step 2: Build object tree in memory
//
JsonObject& root = jsonBuffer.createObject();
root["sensor"] = "gps";
root["time"] = 1351824120;

JsonArray& data = root.createNestedArray("data");
//data.add(48.756080, 6);  // 6 is the number of decimals to print
//data.add(2.302038, 6);   // if not specified, 2 digits are printed
{
  JsonObject& jsens = data.createNestedObject();
  jsens["name"] = "tizio";
  jsens["value"] = true;
}
{
  JsonObject& jsens = data.createNestedObject();
  jsens["name"] = "caio";
  jsens["value"] = 3.141519;
}

//
// Step 3: Generate the JSON string
//
root.printTo(Serial);

The resulting JSON is the following:

{"sensor":"gps","time":1351824120,"data":[{"name":"tizio"}]}

Is it me?

Help using JsonParser and JsonGenerator

Hello, I'm using your library in a little project that I'm working on, but I don't know how to use JsonParser and JsonGenerator at the same time... I was hoping that you could help me, so thanks In advance.

generated json to string

Hello bblanchon, sorry to open a issue for this.
How can i get the generated json into a string (arduino), i don't want it to serial.
For example i need to output to webserver page.

Energia (latest version 0014) issue

compiling the IndentedPrintExample the compiler raises:
IndentedPrintExample.cpp.o: In function setup': IndentedPrintExample.cpp:(.text.setup+0x16): undefined reference tovtable for ArduinoJson::Internals::IndentedPrint'

ArduinoJson on Energia

Hey Man,
I was trying your json library on Energia. Energia is a child stream of Wiring Arduino.
When I tried to compile the example code JsonParser, I got this error
In file included from C:\Users\def\Downloads\energia-0101E0013-windows\energia-0101E0013\hardware\msp430\libraries\ArduinoJson\JsonParser.cpp:11:0:
C:\Users\def\Downloads\energia-0101E0013-windows\energia-0101E0013\hardware\msp430\libraries\ArduinoJson/JsonParser/JsonValue.cpp: In member function 'ArduinoJson::Parser::JsonValue::operator double()':
C:\Users\def\Downloads\energia-0101E0013-windows\energia-0101E0013\hardware\msp430\libraries\ArduinoJson/JsonParser/JsonValue.cpp:39:47: error: 'strtod' was not declared in this scope

I'm not totally sure if your lib can be reused in any project other than for arduino, but since compilation is on gcc, given that it gets all the files, it should compile clean.
It would be great help to have your library compiled for Energia.

Compile on STM32

Hi,

I tried building your nice library with arm-none-eabi-g++ for ST STM32. I got into problems because my compiler did not know size_t in Print.h .

My fix : I included this :

include

before

ifndef ARDUINO

After that, it build without problems.

Conflicts with definitions on <SD.h>

Folks,
I am now able to use the library on the Galileo and Edison IDE with no problems, however I found a new conflict using it with the <SD.h> library.
see the below error messages.
Looks that is a conflict with: redefinition of 'void* operator new(size_t, void*)
Thanks for the help.

AC/.

Arduino: 1.5.3-Intel.1.0.4 (Mac OS X), Board: "Intel® Galileo"

In file included from /Users/acasado/Documents/Arduino/libraries/ArduinoJson2master/include/../include/ArduinoJson/Internals/List.hpp:12:0,
from /Users/acasado/Documents/Arduino/libraries/ArduinoJson2master/include/../include/ArduinoJson/JsonArray.hpp:10,
from /Users/acasado/Documents/Arduino/libraries/ArduinoJson2master/include/ArduinoJson.h:8,
from /Users/acasado/Documents/Arduino/libraries/ArduinoJson2master/ArduinoJson.h:7,
from openweathermap.ino:5:
/Users/acasado/Documents/Arduino/libraries/ArduinoJson2master/include/../include/ArduinoJson/Internals/PlacementNew.hpp: In function 'void* operator new(size_t, void_)':
/Users/acasado/Documents/Arduino/libraries/ArduinoJson2master/include/../include/ArduinoJson/Internals/PlacementNew.hpp:13:14: error: redefinition of 'void_ operator new(size_t, void_)'
In file included from /Users/acasado/Desktop/ArduinoEdison.app/Contents/Resources/Java/hardware/tools/x86/i586-poky-linux-uclibc/usr/include/c++/ext/new_allocator.h:34:0,
from /Users/acasado/Desktop/ArduinoEdison.app/Contents/Resources/Java/hardware/tools/x86/i586-poky-linux-uclibc/usr/include/c++/i586-poky-linux-uclibc/bits/c++allocator.h:34,
from /Users/acasado/Desktop/ArduinoEdison.app/Contents/Resources/Java/hardware/tools/x86/i586-poky-linux-uclibc/usr/include/c++/bits/allocator.h:48,
from /Users/acasado/Desktop/ArduinoEdison.app/Contents/Resources/Java/hardware/tools/x86/i586-poky-linux-uclibc/usr/include/c++/string:43,
from /Users/acasado/Desktop/ArduinoEdison.app/Contents/Resources/Java/hardware/arduino/x86/libraries/SD/SD.h:24,
from GALWeather.ino:22:
/Users/acasado/Desktop/ArduinoEdison.app/Contents/Resources/Java/hardware/tools/x86/i586-poky-linux-uclibc/usr/include/c++/new:111:14: error: 'void_ operator new(std::size_t, void*)' previously defined here

This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.

Memory issues in main loop?

I'm battling what I'm guessing is a memory issue. In my main loop(), I'm creating a parser then parsing a message. If I create the parser as a 64, I can only send 4 messages successfully and get the proper response before the AVR starts rebooting repeatedly and becomes unresponsive even after reset, requiring power off. If I create the parser as a 16, I can send and respond to more messages, 16. It's as if I need a free() for the parser. I'm relatively new to AVR programming, so perhaps it's something I'm doing.

message being parsed: {"color":[200,0,0],"lednum":4,"msgtype":"ledcolor"}

void loop() {
    String msg;

    // fetch json message
    if(Serial.available()) {
        while(1) {
            if(Serial.available()) {
                char chr = Serial.read();
                if (chr == '\r') {
                    break;
                }
                msg += chr;
            }
        }
    }

    // act on message
    if (msg.length() > 0) {
        char * cstr = new char [msg.length() + 1];
        strcpy(cstr, msg.c_str());

        JsonParser<16> parser;
        ArduinoJson::Parser::JsonObject incoming = parser.parse(cstr);
        if (strcmp(incoming["msgtype"],"ledcolor") == 0) {
            ack(1, "got test");
        }
    }
}

void ack(bool success, char * msg) {
    ArduinoJson::Generator::JsonObject<3> outgoing;
    outgoing["msgtype"] = "ack";
    outgoing["result"] = success;
    outgoing["detail"] = msg;

    Serial.println(outgoing);
}

Deleting properties from JSON Generator?

Hi,
I was wondering if you had any examples of deleting entries from a Generator::JsonObject object. I notice that using add with the same key just appends it to the object.

Writing a floating point 0.0 results in integer insertion into JSON array

Bon jour Benoît,

When I construct a JSON array like this :

for (unsigned int i=0;i<5;i++)
{
        JsonArray<3> sensorwaarde;

        sensorwaarde.add((long int)i);
        sensorwaarde.add((i%2==0) ? true : false);
        sensorwaarde.add<4>((double)(i*42.34));
}

I explicitly add a floating point value in the 3rd array slot .

However, when I print the resulting strings and process them with wxJSON , I get an error reading the first double, because in the JSON array the 0.0f has (inadvertently) been converted to an integer.

The other values (42.34 .. 169.36) are correctly printed as floats in the array.

15:40:00: json object[0] = {"sensornaam":"Hoogtesensor","waarde":[0,true,0]}
15:40:00: json object[1] = {"sensornaam":"Hoogtesensor","waarde":[1,false,42.34]}
15:40:00: json object[2] = {"sensornaam":"Hoogtesensor","waarde":[2,true,84.68]}
15:40:00: json object[3] = {"sensornaam":"Hoogtesensor","waarde":[3,false,127.02]}
15:40:00: json object[4] = {"sensornaam":"Hoogtesensor","waarde":[4,true,169.36]}

15:40:00: wxJSON parsing[0] : [stand] = 1
/Users/oldenburgh/techniek/software/consoletest/../externals/desktop/wx/wxJSON/jsonval.cpp(907): assert "IsDouble()" failed in AsDouble().
Collecting stack trace information, please wait...

Call stack:
[00] wxJSONValue::AsDouble() const           
[01] ConsoleTest::jsonTest()                    jsonTest.cpp:8
[02] ConsoleTest::MainLoop()                    main.cpp:5
[03] wxEntry(int&, wchar_t**)                
[04] main                                       main.cpp:1
[05] start                                   
[06] 0x00000001                              
15:40:00: wxJSON parsing[0] : [waarde] = 0.000000
15:40:00: wxJSON parsing[1] : [stand] = 0
15:40:00: wxJSON parsing[1] : [waarde] = 42.340000
15:40:00: wxJSON parsing[2] : [stand] = 1
15:40:00: wxJSON parsing[2] : [waarde] = 84.680000
15:40:00: wxJSON parsing[3] : [stand] = 0
15:40:00: wxJSON parsing[3] : [waarde] = 127.020000
15:40:00: wxJSON parsing[4] : [stand] = 1
15:40:00: wxJSON parsing[4] : [waarde] = 169.360000
15:40:00: Arduino JSON test einde`

I was unable to precisely debug the inner workings of the

            void set(double value)
            {
                printToImpl = &printDoubleTo < DIGITS > ;
                content.asDouble = value;
            }

function.... Perhaps you could assist me in finding out what goes wrong.

The "new" operator definition collides with the standard (?) one

Benoit, your library is simply awesome: no kidding!
ATM, I'm still in the phase of "assembly" several parts or a small project, originally written in C#, but my knowledge yet experience in C/C++ is close to zero.
https://highfieldtales.wordpress.com/2014/11/07/azure-veneziano-part-1/

More specifically, I'm re-writing the code for the Seeedstudio Link-It, which is an ARM-based board, and comes with a Arduino 1.5-like SDK.
http://www.seeedstudio.com/depot/LinkIt-ONEBackorder-p-2017.html

The problem I bumped to is against your "new" operator definition (PlacementNew.hpp). If I leave it, the compilation raises an error about the re-definition of the "new" operator. If comment out, there's no collision, but your List.cpp module (and another one, I think) raises a overloading not found for the operator "new".
Right now I'm in the office and I don't have the exact errors, but I may send you once at home.

Any clue?

Thanks and have a happy Christmas.
Mario

Usage of both parser and generator

How can we use both generator and parser in the same Arduino sketch without getting namespace conflict errors?

Missing newline at end of file

Hi,

when I compile the library on FreeBSD 9.2, I get a number of warnings regarding end-of-lines that are missing 👍

[ 76%] Building CXX object software/extern/json/CMakeFiles/ArduinoJSonGenerator.dir/ArduinoJson/JsonGenerator/EscapedString.cpp.o In file included from /home/oldenburgh/techniek/software/externals/software/extern/json/ArduinoJson/JsonGenerator/EscapedString.cpp:6: /home/oldenburgh/techniek/software/externals/software/extern/json/ArduinoJson/JsonGenerator/EscapedString.h:20:2: error: no newline at end of file /home/oldenburgh/techniek/software/externals/software/extern/json/ArduinoJson/JsonGenerator/EscapedString.cpp:45:2: error: no newline at end of file gmake[2]: *** [software/extern/json/CMakeFiles/ArduinoJSonGenerator.dir/ArduinoJson/JsonGenerator/EscapedString.cpp.o] Error 1 gmake[1]: *** [software/extern/json/CMakeFiles/ArduinoJSonGenerator.dir/all] Error 2 gmake: *** [all] Error 2

and

gmake[2]: *** [software/extern/json/CMakeFiles/ArduinoJSonGenerator.dir/ArduinoJson/JsonGenerator/IndentedPrint.cpp.o] Error 1

Would it be possible to check all files to have proper line endings, ie the last statement MUST include a CR at the end and a newline below it. I know on Windows this isn't an issue but on other platforms such as FreeBSD the compiler does not like it.

has_key?

Is there a reliable method of checking to see if the JSON data contains a given key? The methods I'm trying are all failing horribly and I'm sure it's my fault.

Ver 4.2 may have a memory leak

I modified the JsonParserExample to call a function do do the parsing
Setup just sets baudrate
loop calls a function that passes in the json char array the parse function runs then delays for 10 seconds
the first 3 times thru the loop it appears all ok, 4 and onward times thru the loop the prse function reports parse Object fail
I can provide test sketch but don't see how to add the attachment to this new issue post

Dynamic size

It will be perfect if we can find a way to let the size to be dynamic in your Parser and/or Generator :)

I think generator will not be too much tricky compared to parser. Without breaking the code, you can add extra classes that will merge the static allocated objects and arrays.

Here is an example:

JsonObject<2> staticObject1;
JsonObject<1> staticObject2;

staticObject1["key1"] = 1;
staticObject1["key2"] = 2;
staticObject2["key3"] = 3;

DynamicJsonObject dynamicObject;

dynamicObject.merge(staticObject1);
dynamicObject.merge(staticObject2);

Serial.print(dynamicObject);

Implement iterator for JSONHashTable and JSONArray

Something like this -

for ( auto i = jsonHashTable.begin(), i != jsonHashTable.end(); i++ ) {
    cout << "Key " << i->first;
    cout << "Value" << i->second;
}

for ( auto i = jsonArray.begin(), i != jsonArray.end(); i++ ) {
    cout << "Value" << *i;
}

I think this will involve writing a custom iterator (see http://www.cplusplus.com/reference/iterator/) for these two classes, hopefully it isn't too difficult.

Duplicate file name (JsonValue) in parser and generator

So I was attempting to upgrade to the new version and realised that a file is named JsonValue in the parser and the generator.

I know they are in different namespaces but the object file ends up being called JsonValue.o with our build system. Can we not rename them so they don't clash with each other?

4.2 wont verify in eclipseArduinoIDE

I download the eclipseArduinoIDE from http://www.baeyens.it/eclipse/,

When I verify JsonParserExample.ino in the eclipseArduinoIDE using ArduinoIDE1.5.6-r2 which eclipse insists to,
I get the error:

Starting combiner
"E:/arduino/LinkItOne/arduino-1.5.6-r2/hardware/tools/g++arm_none_eabi/bin/arm-none-eabi-g++" -O2 -Wl,--gc-sections -mcpu=arm7tdmi-s "-T/E:/arduino/LinkItOne/arduino-1.5.6-r2/hardware/arduino/mtk/variants/linkit_one/linker_scripts/gcc/scat.ld" "-Wl,-Map,E:/arduino/LinkItOne/eclipseArduino/workspace/Test/Release/Test.map" -o "E:/arduino/LinkItOne/eclipseArduino/workspace/Test/Release/Test.elf" "-LE:/arduino/LinkItOne/eclipseArduino/workspace/Test/Release" -lm -fpic -msvr4-struct-return -pie -Wl,--entry=gcc_entry -Wl,--unresolved-symbols=report-all -Wl,--warn-common -Wl,--warn-unresolved-symbols -Wl,--start-group "E:/arduino/LinkItOne/eclipseArduino/workspace/Test/Release/arduino/syscalls_mtk.c.o" ./.ino.cpp.o ./Libraries/Wire/example/LiquidCrystal_I2C1602V1/LiquidCrystal_I2C.cpp.o ./Libraries/Wire/Wire.cpp.o ./Libraries/Stepper/Stepper.cpp.o ./Libraries/Servo/Servo.cpp.o ./Libraries/SPI/SPI.cpp.o ./Libraries/LWiFi/LWiFi.cpp.o ./Libraries/LWiFi/LWiFiClient.cpp.o ./Libraries/LWiFi/LWiFiServer.cpp.o ./Libraries/LWiFi/LWiFiUdp.cpp.o ./Libraries/LStorage/LFlash.cpp.o ./Libraries/LStorage/LSD.cpp.o ./Libraries/LStorage/LStorage.cpp.o ./Libraries/LGSM/utility/VoiceCall.cpp.o ./Libraries/LGSM/LSMS.cpp.o ./Libraries/LGSM/LVoiceCall.cpp.o ./Libraries/LGPS/utility/GPS.cpp.o ./Libraries/LGPS/LGPS.cpp.o ./Libraries/LGPRS/LGPRS.cpp.o ./Libraries/LGPRS/LGPRSClient.cpp.o ./Libraries/LGPRS/LGPRSServer.cpp.o ./Libraries/LGPRS/LGPRSUdp.cpp.o ./Libraries/LGATT/utility/GATTClient.cpp.o ./Libraries/LGATT/utility/GATTServer.cpp.o ./Libraries/LGATT/LGATTClient.cpp.o ./Libraries/LGATT/LGATTServer.cpp.o ./Libraries/LGATT/LGATTUUID.cpp.o ./Libraries/LEEPROM/utility/sysfile.cpp.o ./Libraries/LEEPROM/LEEPROM.cpp.o ./Libraries/LDateTime/LDateTime.cpp.o ./Libraries/LBattery/utility/Battery.cpp.o ./Libraries/LBattery/LBattery.cpp.o ./Libraries/LBT/utility/BTClient.cpp.o ./Libraries/LBT/utility/BTServer.cpp.o ./Libraries/LBT/LBT.cpp.o ./Libraries/LBT/LBTClient.cpp.o ./Libraries/LBT/LBTServer.cpp.o ./Libraries/LAudio/utility/Audio.cpp.o ./Libraries/LAudio/LAudio.cpp.o ./Libraries/ArduinoJson/src/Internals/IndentedPrint.cpp.o ./Libraries/ArduinoJson/src/Internals/JsonParser.cpp.o ./Libraries/ArduinoJson/src/Internals/List.cpp.o ./Libraries/ArduinoJson/src/Internals/Prettyfier.cpp.o ./Libraries/ArduinoJson/src/Internals/QuotedString.cpp.o ./Libraries/ArduinoJson/src/Internals/StringBuilder.cpp.o ./Libraries/ArduinoJson/src/Arduino/Print.cpp.o ./Libraries/ArduinoJson/src/JsonArray.cpp.o ./Libraries/ArduinoJson/src/JsonBuffer.cpp.o ./Libraries/ArduinoJson/src/JsonObject.cpp.o ./Libraries/ArduinoJson/src/JsonVariant.cpp.o ./Libraries/ArduinoJson/ArduinoJson.cpp.o E:/arduino/LinkItOne/eclipseArduino/workspace/Test/Release/arduino.ar "/E:/arduino/LinkItOne/arduino-1.5.6-r2/hardware/arduino/mtk/variants/linkit_one/libmtk.a" "E:/arduino/LinkItOne/eclipseArduino/workspace/Test/Release/arduino.ar" -Wl,--end-group
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::Internals::IndentedPrint::write(unsigned char)': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/IndentedPrint.cpp:11: multiple definition ofArduinoJson::Internals::IndentedPrint::write(unsigned char)'
./Libraries/ArduinoJson/src/Internals/IndentedPrint.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/Internals/IndentedPrint.cpp:11: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::Internals::JsonParser::skip(char const*)': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/JsonParser.cpp:32: multiple definition ofArduinoJson::Internals::JsonParser::skip(char const)'
./Libraries/ArduinoJson/src/Internals/JsonParser.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/Internals/JsonParser.cpp:32: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::Internals::QuotedString::extractFrom(char_, char**)': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/QuotedString.cpp:60: multiple definition of ArduinoJson::Internals::QuotedString::extractFrom(char*, char**)'
./Libraries/ArduinoJson/src/Internals/QuotedString.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/Internals/QuotedString.cpp:60: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::Internals::StringBuilder::write(unsigned char)': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/StringBuilder.cpp:11: multiple definition ofArduinoJson::Internals::StringBuilder::write(unsigned char)'
./Libraries/ArduinoJson/src/Internals/StringBuilder.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/Internals/StringBuilder.cpp:11: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonArray::at(int) const': E:/arduino/workspace/libraries/ArduinoJson/src/JsonArray.cpp:17: multiple definition ofArduinoJson::JsonArray::at(int) const'
./Libraries/ArduinoJson/src/JsonArray.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonArray.cpp:17: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonBuffer::createArray()': E:/arduino/workspace/libraries/ArduinoJson/src/JsonBuffer.cpp:16: multiple definition ofArduinoJson::JsonBuffer::createArray()'
./Libraries/ArduinoJson/src/JsonBuffer.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonBuffer.cpp:16: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonBuffer::createObject()': E:/arduino/workspace/libraries/ArduinoJson/src/JsonBuffer.cpp:21: multiple definition ofArduinoJson::JsonBuffer::createObject()'
./Libraries/ArduinoJson/src/JsonBuffer.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonBuffer.cpp:21: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonVariant::operator ArduinoJson::JsonArray&() const': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:17: multiple definition ofArduinoJson::JsonVariant::operator ArduinoJson::JsonArray&() const'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:17: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonVariant::operator ArduinoJson::JsonObject&() const': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:21: multiple definition ofArduinoJson::JsonVariant::operator ArduinoJson::JsonObject&() const'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:21: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonVariant::operator bool() const': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:25: multiple definition ofArduinoJson::JsonVariant::operator bool() const'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:25: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonVariant::operator char const*() const': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:29: multiple definition ofArduinoJson::JsonVariant::operator char const_() const'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:29: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonVariant::operator double() const': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:33: multiple definition ofArduinoJson::JsonVariant::operator double() const'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:33: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonVariant::operator long() const': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:37: multiple definition ofArduinoJson::JsonVariant::operator long() const'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:37: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonVariant::set(bool)': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:41: multiple definition ofArduinoJson::JsonVariant::set(bool)'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:41: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonVariant::set(char const_)': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:47: multiple definition of ArduinoJson::JsonVariant::set(char const*)'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:47: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In functionArduinoJson::JsonVariant::set(double, unsigned char)': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:53: multiple definition of ArduinoJson::JsonVariant::set(double, unsigned char)'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:53: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In functionArduinoJson::JsonVariant::set(long)': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:59: multiple definition of ArduinoJson::JsonVariant::set(long)'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:59: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In functionArduinoJson::JsonVariant::set(ArduinoJson::JsonArray&)': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:65: multiple definition of ArduinoJson::JsonVariant::set(ArduinoJson::JsonArray&)'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:65: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In functionArduinoJson::JsonVariant::set(ArduinoJson::JsonObject&)': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:71: multiple definition of ArduinoJson::JsonVariant::set(ArduinoJson::JsonObject&)'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:71: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In functionArduinoJson::JsonVariant::size() const': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:77: multiple definition of ArduinoJson::JsonVariant::size() const'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:77: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In functionArduinoJson::JsonVariant::operator[](int)': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:83: multiple definition of ArduinoJson::JsonVariant::operator'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:83: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In functionArduinoJson::Internals::QuotedString::printTo(char const_, Print&)': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/QuotedString.cpp:34: multiple definition of ArduinoJson::Internals::QuotedString::printTo(char const_, Print&)'
./Libraries/ArduinoJson/src/Internals/QuotedString.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/Internals/QuotedString.cpp:34: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonObject::getNodeAt(char const*) const': E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:62: multiple definition ofArduinoJson::JsonObject::getNodeAt(char const_) const'
./Libraries/ArduinoJson/src/JsonObject.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:62: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonObject::remove(char const_)': E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:46: multiple definition of ArduinoJson::JsonObject::remove(char const*)'
./Libraries/ArduinoJson/src/JsonObject.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:46: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In functionArduinoJson::JsonObject::operator[](char const*)': E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:30: multiple definition of ArduinoJson::JsonObject::operator[](char const*)'
./Libraries/ArduinoJson/src/JsonObject.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:30: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In functionArduinoJson::JsonVariant::operator[](char const*)': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:88: multiple definition of ArduinoJson::JsonVariant::operator[](char const*)'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:88: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In functionArduinoJson::JsonObject::createNestedObject(char const_)': E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:55: multiple definition of ArduinoJson::JsonObject::createNestedObject(char const_)'
./Libraries/ArduinoJson/src/JsonObject.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:55: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonObject::createNestedArray(char const*)': E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:48: multiple definition ofArduinoJson::JsonObject::createNestedArray(char const_)'
./Libraries/ArduinoJson/src/JsonObject.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:48: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonObject::at(char const_) const': E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:25: multiple definition of ArduinoJson::JsonObject::at(char const*) const'
./Libraries/ArduinoJson/src/JsonObject.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:25: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In functionArduinoJson::JsonObject::at(char const_)': E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:20: multiple definition of ArduinoJson::JsonObject::at(char const_)'
./Libraries/ArduinoJson/src/JsonObject.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:20: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::Internals::Prettyfier::unindentIfNeeded()': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/Prettyfier.cpp:81: multiple definition ofArduinoJson::Internals::Prettyfier::unindentIfNeeded()'
./Libraries/ArduinoJson/src/Internals/Prettyfier.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/Internals/Prettyfier.cpp:81: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::Internals::Prettyfier::indentIfNeeded()': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/Prettyfier.cpp:74: multiple definition ofArduinoJson::Internals::Prettyfier::indentIfNeeded()'
./Libraries/ArduinoJson/src/Internals/Prettyfier.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/Internals/Prettyfier.cpp:74: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::Internals::Prettyfier::write(unsigned char)': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/Prettyfier.cpp:11: multiple definition ofArduinoJson::Internals::Prettyfier::write(unsigned char)'
./Libraries/ArduinoJson/src/Internals/Prettyfier.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/Internals/Prettyfier.cpp:11: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::Internals::JsonParser::skipSpaces()': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/JsonParser.cpp:20: multiple definition ofArduinoJson::Internals::JsonParser::skipSpaces()'
./Libraries/ArduinoJson/src/Internals/JsonParser.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/Internals/JsonParser.cpp:20: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::Internals::JsonParser::skip(char)': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/JsonParser.cpp:24: multiple definition ofArduinoJson::Internals::JsonParser::skip(char)'
./Libraries/ArduinoJson/src/Internals/JsonParser.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/Internals/JsonParser.cpp:24: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonObject::writeTo(ArduinoJson::Internals::JsonWriter&) const': E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:69: multiple definition ofArduinoJson::JsonObject::writeTo(ArduinoJson::Internals::JsonWriter&) const'
./Libraries/ArduinoJson/src/JsonObject.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonObject.cpp:69: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonVariant::writeTo(ArduinoJson::Internals::JsonWriter&) const': E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:93: multiple definition ofArduinoJson::JsonVariant::writeTo(ArduinoJson::Internals::JsonWriter&) const'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:93: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonArray::writeTo(ArduinoJson::Internals::JsonWriter&) const': E:/arduino/workspace/libraries/ArduinoJson/src/JsonArray.cpp:46: multiple definition ofArduinoJson::JsonArray::writeTo(ArduinoJson::Internals::JsonWriter&) const'
./Libraries/ArduinoJson/src/JsonArray.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonArray.cpp:46: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonArray::add()': E:/arduino/workspace/libraries/ArduinoJson/src/JsonArray.cpp:23: multiple definition ofArduinoJson::JsonArray::add()'
./Libraries/ArduinoJson/src/JsonArray.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonArray.cpp:23: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonArray::createNestedObject()': E:/arduino/workspace/libraries/ArduinoJson/src/JsonArray.cpp:39: multiple definition ofArduinoJson::JsonArray::createNestedObject()'
./Libraries/ArduinoJson/src/JsonArray.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonArray.cpp:39: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonArray::createNestedArray()': E:/arduino/workspace/libraries/ArduinoJson/src/JsonArray.cpp:32: multiple definition ofArduinoJson::JsonArray::createNestedArray()'
./Libraries/ArduinoJson/src/JsonArray.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonArray.cpp:32: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::Internals::JsonParser::parseArray()': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/JsonParser.cpp:89: multiple definition ofArduinoJson::Internals::JsonParser::parseArray()'
./Libraries/ArduinoJson/src/Internals/JsonParser.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/Internals/JsonParser.cpp:89: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::Internals::JsonParser::parseAnythingTo(ArduinoJson::JsonVariant&)': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/JsonParser.cpp:41: multiple definition ofArduinoJson::Internals::JsonParser::parseAnythingTo(ArduinoJson::JsonVariant&)'
./Libraries/ArduinoJson/src/Internals/JsonParser.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/Internals/JsonParser.cpp:41: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonBuffer::parseArray(char*, unsigned char)': E:/arduino/workspace/libraries/ArduinoJson/src/JsonBuffer.cpp:26: multiple definition ofArduinoJson::JsonBuffer::parseArray(char_, unsigned char)'
./Libraries/ArduinoJson/src/JsonBuffer.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonBuffer.cpp:26: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::Internals::JsonParser::parseObject()': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/JsonParser.cpp:119: multiple definition ofArduinoJson::Internals::JsonParser::parseObject()'
./Libraries/ArduinoJson/src/Internals/JsonParser.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/Internals/JsonParser.cpp:119: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function ArduinoJson::JsonBuffer::parseObject(char_, unsigned char)': E:/arduino/workspace/libraries/ArduinoJson/src/JsonBuffer.cpp:31: multiple definition of ArduinoJson::JsonBuffer::parseObject(char*, unsigned char)'
./Libraries/ArduinoJson/src/JsonBuffer.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonBuffer.cpp:31: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In functionArduinoJson::Internals::IndentedPrint::writeTabs()': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/../../include/ArduinoJson/Internals/List.hpp:60: multiple definition of ArduinoJson::JsonArray::_invalid'
./Libraries/ArduinoJson/src/JsonArray.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonArray.cpp:17: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In functionArduinoJson::Internals::IndentedPrint::writeTabs()': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/../../include/ArduinoJson/Internals/ListNode.hpp:20: multiple definition of ArduinoJson::JsonObject::_invalid'
./Libraries/ArduinoJson/src/JsonObject.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/../include/ArduinoJson/Internals/List.hpp:32: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o: In function.LANCHOR1': E:/arduino/workspace/libraries/ArduinoJson/src/Internals/IndentedPrint.cpp:11: multiple definition of ArduinoJson::JsonVariant::_invalid'
./Libraries/ArduinoJson/src/JsonVariant.cpp.o:E:/arduino/workspace/libraries/ArduinoJson/src/JsonVariant.cpp:17: first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o:(.data.rel.ro+0x0): multiple definition ofvtable for ArduinoJson::Internals::StringBuilder' ./Libraries/ArduinoJson/src/Internals/StringBuilder.cpp.o:(.data.rel.ro+0x0): first defined here ./Libraries/ArduinoJson/ArduinoJson.cpp.o:(.data.rel.ro+0x10): multiple definition of vtable for ArduinoJson::Internals::Prettyfier'
./Libraries/ArduinoJson/src/Internals/Prettyfier.cpp.o:(.data.rel.ro+0x0): first defined here
./Libraries/ArduinoJson/ArduinoJson.cpp.o:(.data.rel.ro+0x20): multiple definition of`vtable for ArduinoJson::Internals::IndentedPrint'
./Libraries/ArduinoJson/src/Internals/IndentedPrint.cpp.o:(.data.rel.ro+0x0): first defined here
collect2: ld returned 1 exit status

Only the ArduinoJson will be error. help.....

Ethernet Compatibility

Trying to send the JSON data using the Arduino Ethernet library.
Is this possible with the library you have written?
If so could you provide a small example?