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a modern JSON library for C++20 that's convenient to use (github.com)
submitted 1 year ago by to c/cpp@programming.dev
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It's not fully finished yet, but it's getting there, and i didn't write documentation beyond the README.md and tests/test.cpp but I'd like some feedback on it.

features

  • It's a header only library that's currently < 3000 loc
  • no 3rd-party dependencies
  • support for being imported as a module
  • supports inserting std containers into json nodes
  • highly type safe, which is made possible by using concepts
  • easy-to-use object/array iterations
  • easy-to-use type casting from json value to native c++ types which is enabled by std::variant and concepts
  • exception-free parsing and value casting.
  • modern error handling using "expected" type
  • exception-free node.try_at("key") access
  • and more

edit:

documentation link: https://nodeluna.github.io/ljson

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[–] 3 points 1 year ago (1 child)

Neat! Could you expand on why someone might prefer to use this instead of other json parsing libs such as nlohmann or simdjson?

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  • [–] [S] 2 points 1 year ago* (last edited 1 year ago)

    thank you! if someone wants a more modern API that's kinda similar to tomlplusplus and a little nicer to use with modern error handling then my library might come in handy. my API is inspired a lot by tomlplusplus . i was trying to make a build system that uses TOML as a config file and I needed a json library so i decided to make my own as a learning experience which was great.

    I'm not familiar with simdjson, but i know a little about nlohmann and I think the exception free path using ljson::expected is a nicer/safer approach. also there is convenient operator overloads in my library to add objects/array together, but nlohmann also has that i think

    // accessing values in ljson
ljson::node node = ljson::parser::parse(raw_json);
std::string val = node.at("key").as_string();

// accessing values in nlohmann
nlohmann::json::json json;
raw_json >> json;
std::string val = json["key"].get<std::string>();
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