simdjson is a C++ library that can parse JSON documents very fast. Version 1. 0 has been just released. How does it compare?
Does parsing 3 gigabytes of JSON per second sound fast enough?
This library achieves it. In last year's benchmark against the fastest standard compliant C++ JSON parsers, RapidJSON and sajson, smidjson by far outperformed them. It can parse 4x faster than RapidJSON and 25x faster than Modern C++.
full article on i-programmer.info:
https://www.i-programmer.info/news/90-tools/14931-a-lightening-fast-json-parser-library.html
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