GJSON is a Go library designed for extremely fast, allocation-free retrieval of values from JSON documents. It enables you to query nested JSON structures using one-liner dot-notation or array-based paths and includes wildcard and comparison operators. The library is optimized for speed and zero allocations, benchmarking significantly faster than Go’s standard encoding/json unmarshal approaches. It supports parsing JSON lines (newline-delimited JSON) as an array for large stream processing. ...
Another C++ based JSON Library (/w Parser/Generator/Navigator)
Native C++ implementation of a JSON library.
Contains a Parser, a Generator and and easy-to-use Navigator in one single class.
To build you will need at least a C++11 capable compiler such as MSVC 10 (express edition).
There is no other 3rd party library required to compile or run it.