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。
主要特点：
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
快速
无需依赖其他第三方库
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.
完全兼容 RFC4627 ，支持 UTF-8, UTF-16 和 UTF-32.
Support both in-situ parsing (directly decode strings into the source JSON text) and non-destructive parsing (decode strings into new buffers).
Parse number to int/unsigned/int64_t/uint64_t/double depending on input
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.
官方首页：http://code.google.com/p/rapidjson/
免费下载：http://code.google.com/p/rapidjson/downloads/list
来自:开源中国社区
