The library is part of major linux distributions like Ubuntu and Debian and as a FreeBSD package. It is in Microsoft vpkg. It is available as an MSYS2 package, from brew and from conan. We publish it as single-header library as well as a CMake build from theGitHub repository. We have a simdjson organization on GitHub.

Quick Start

Prerequisites: g++ (version 7 or better) or clang++(version 6 or better), and a 64-bit system (e.g., linux, Windows, FreeBSD, macOS).

  1. Pull simdjson.h and simdjson.cpp from our singleheader directory into a directory of your choice, along with the sample file twitter.json from our jsonexamples repository..
  2. Create quickstart.cpp:
   #include "simdjson.h"
   using namespace simdjson;
   int main(void) {
      ondemand::parser parser;
      padded_string json = padded_string::load("twitter.json");
      ondemand::document tweets = parser.iterate(json);
      std::cout << uint64_t(tweets["search_metadata"]["count"]) << " results." << std::endl;
  • Compile:

       c++ -o quickstart quickstart.cpp simdjson.cpp -std=c++17

  • Run:



Usage documentation is available:

  • Basics is an overview of how to use simdjson and its APIs.
  • Performance shows some more advanced scenarios and how to tune for them.
  • Implementation Selection describes runtime CPU detection and how you can work with it.

Real-world usage

If you are planning to use simdjson in a product, please work from one of our releases.

Bindings and Ports of simdjson

We distinguish between “bindings” (which just wrap the C++ code) and a port to another programming language (which reimplements everything).