daw_json_link

I just released v3 of DAW JSON Link https://github.com/beached/daw_json_link, a C++ JSON library, that I am the author of. It's a C++ JSON library that prioritizes concrete data structures. It is fast, GB/s, and competitive with other libraries out there like simdjson. A brief list of things it supports are: * declaratively map json objects to C++ data structures * allows allocators to be provided and passes it to allocator aware types * can parse via a non-owning json_value that allows JSON Path like indices along with iteration of sub members * types to provide iteration over json arrays and use in C++ algorithms * JSON Lines/NDJSON support * The parser does not allocate at all, that is up to the resulting data structures, if needed. The memory usage is very minimal * Variants/Sum types are a priority and most express

Check out https://github.com/beached/daw_json_link , it provides a non-typeerased way to parse JSON straight into user-defined data structures.

Not Rust, but for C++ I have found a lot of memory and CPU perf can be realized by knowing what is being parsed into and using that. Most JSON parsing optimize on array/object/number/bool/null and not things like unsigned integer being much faster to parse than a float(floating point hit cpu bottlenecks around 1GB/s). Additionally, allowing for compile time options to further optimize is much easier. Essentially most JSON parsers are type erased. https://github.com/beached/daw_json_link So this correlates with some of the findings the post has. One optimization that should show great promise is that if one knows that they have an array of some types like numbers/unsigned int/strings, that can greatly simplify and allow for SIMD'ification of it.