A fast JSON parser/generator for C++ with both SAX/DOM style API
Tencent is pleased to support the open source community by making RapidJSON available.
Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip.
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RapidJSON is a JSON parser and generator for C++. It was inspired by RapidXml.
RapidJSON is small but complete. It supports both SAX and DOM style API. The SAX parser is only a half thousand lines of code.
RapidJSON is fast. Its performance can be comparable to
strlen(). It also optionally supports SSE2/SSE4.2 for acceleration.
RapidJSON is self-contained and header-only. It does not depend on external libraries such as BOOST. It even does not depend on STL.
RapidJSON is memory-friendly. Each JSON value occupies exactly 16 bytes for most 32/64-bit machines (excluding text string). By default it uses a fast memory allocator, and the parser allocates memory compactly during parsing.
RapidJSON is Unicode-friendly. It supports UTF-8, UTF-16, UTF-32 (LE & BE), and their detection, validation and transcoding internally. For example, you can read a UTF-8 file and let RapidJSON transcode the JSON strings into UTF-16 in the DOM. It also supports surrogates and "\u0000" (null character).
More features can be read here.
JSON(JavaScript Object Notation) is a light-weight data exchange format. RapidJSON should be in full compliance with RFC7159/ECMA-404, with optional support of relaxed syntax. More information about JSON can be obtained at * Introducing JSON * RFC7159: The JavaScript Object Notation (JSON) Data Interchange Format * Standard ECMA-404: The JSON Data Interchange Format
Valuefrom 24 bytes to 16 bytes in x86-64 architecture.
For other changes please refer to change log.
RapidJSON is cross-platform. Some platform/compiler combinations which have been tested are shown as follows. * Visual C++ 2008/2010/2013 on Windows (32/64-bit) * GNU C++ 3.8.x on Cygwin * Clang 3.4 on Mac OS X (32/64-bit) and iOS * Clang 3.4 on Android NDK
Users can build and run the unit tests on their platform/compiler.
RapidJSON is a header-only C++ library. Just copy the
include/rapidjsonfolder to system or project's include path.
Alternatively, if you are using the vcpkg dependency manager you can download and install rapidjson with CMake integration in a single command: * vcpkg install rapidjson
RapidJSON uses following software as its dependencies: * CMake as a general build tool * (optional) Doxygen to build documentation * (optional) googletest for unit and performance testing
To generate user documentation and run tests please proceed with the steps below:
git submodule update --initto get the files of thirdparty submodules (google test).
buildin rapidjson source directory.
builddirectory and run
cmake ..command to configure your build. Windows users can do the same with cmake-gui application.
makefrom the build directory.
On successful build you will find compiled test and example binaries in
bindirectory. The generated documentation will be available in
doc/htmldirectory of the build tree. To run tests after finished build please run
make testor
ctestfrom your build tree. You can get detailed output using
ctest -Vcommand.
It is possible to install library system-wide by running
make installcommand from the build tree with administrative privileges. This will install all files according to system preferences. Once RapidJSON is installed, it is possible to use it from other CMake projects by adding
find_package(RapidJSON)line to your CMakeLists.txt.
This simple example parses a JSON string into a document (DOM), make a simple modification of the DOM, and finally stringify the DOM to a JSON string.
// rapidjson/example/simpledom/simpledom.cpp` #include "rapidjson/document.h" #include "rapidjson/writer.h" #include "rapidjson/stringbuffer.h" #includeusing namespace rapidjson;
int main() { // 1. Parse a JSON string into DOM. const char* json = "{"project":"rapidjson","stars":10}"; Document d; d.Parse(json);
// 2. Modify it by DOM. Value& s = d["stars"]; s.SetInt(s.GetInt() + 1); // 3. Stringify the DOM StringBuffer buffer; Writer<stringbuffer> writer(buffer); d.Accept(writer); // Output {"project":"rapidjson","stars":11} std::cout << buffer.GetString() << std::endl; return 0;
}
Note that this example did not handle potential errors.
The following diagram shows the process.
More examples are available:
DOM API
SAX API
Reader.
PrettyWriter.
JsonxWriterwhich stringify SAX events into JSONx (a kind of XML) format. The example is a command line tool which converts input JSON into JSONx format.
Schema
Advanced
AsyncDocumentParserwhich can parse JSON in parts, using C++11 thread.
Document.
RapidJSON welcomes contributions. When contributing, please follow the code below.
Feel free to submit issues and enhancement requests.
Please help us by providing minimal reproducible examples, because source code is easier to let other people understand what happens. For crash problems on certain platforms, please bring stack dump content with the detail of the OS, compiler, etc.
Please try breakpoint debugging first, tell us what you found, see if we can start exploring based on more information been prepared.
In general, we follow the "fork-and-pull" Git workflow.
unittestand
preftest, please add test case for each new feature or bug-fix if needed.
NOTE: Be sure to merge the latest from "upstream" before making a pull request!
You can copy and paste the license summary from below.
Tencent is pleased to support the open source community by making RapidJSON available.Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip.
Licensed under the MIT License (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://opensource.org/licenses/MIT
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.