一个 C++ 的快速 JSON 解析器和生成器：Rapidjson
Rapidjson 是一个 C++ 的快速 JSON 解析器和生成器，使用 SAX/DOM 风格的 API 设计。
示例代码：
// rapidjson/example/simpledom/simpledom.cpp` #include "rapidjson/document.h" #include "rapidjson/writer.h" #include "rapidjson/stringbuffer.h" #include <iostream> using 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; } 主要特点：
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体积小，功能全，提供 SAX 和 DOM 风格的 API，仅是 SAX 解析器只有百行代码
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快速
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无需依赖其他第三方库
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Compact. Each JSON value is 16 or 20 bytes for 32 or 64-bit machines respectively (excluding text string storage). With the custom memory allocator, parser allocates memory compactly during parsing.
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完全兼容 RFC4627 ，支持 UTF-8, UTF-16 和 UTF-32.
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Support both in-situ parsing (directly decode strings into the source JSON text) and non-destructive parsing (decode strings into new buffers).
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Parse number to int/unsigned/int64_t/uint64_t/double depending on input
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支持自定义内存分配。Also, the default memory pool allocator can also be supplied with a user buffer (such as a buffer allocated on user's heap or programme stack) to minimize allocation.