simdjson is an awesome project. However, it's analogous to a SAX parser for XML vs a DOM model. If that is all you need (or if you are building something like a

simdjson is an awesome project. However, it's analogous to a SAX parser for XML vs a DOM model. If that is all you need (or if you are building something like a DOM yourself) then it is pretty much impossible to beat. Having an entire JSON document parsed and in memory at once though has a bunch of advantages for a friendlier API.